Thomas Zega

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Courses

C
Cosmochemistry
CSS
Chemistry of the Solar System
PM
Planetary Materials
NAMUTEM
Nanoscale Analysis of Materials Using Transmission Electron Microscopy
TUHOD
The Universe and Humanity: Origin and Destiny
UHEPS
Universe and Humanity: Exploring our Place in Space

A
Astrochemistry

Grants

The Kuiper Materials Imaging and Characterization Facility at the University of Arizona
Principal Investigator (PI)
2022
$599.0K
Active
Alien Earths: Which Nearby Planetary Systems Are Likely to Host Habitable Planets and Life?
Co-Investigator (COI)
2021
$2.8M
Active
MRI: Development of the Next Generation 211-373 GHz Receiver for the Arizona Radio Observatory's Sub-mm Telescope
Co-Investigator (COI)
2021
$982.8K
Active
A Next-Generation Nanoscale Secondary Ion Mass Spectrometer for the Analysis of Planetary Materials
Co-Investigator (COI)
2020
$2.4M
Active
Investigating Degassing Histories of Apollo 15 and 17 Lunar Basalts with 3D Visualization and Coordinated Microanalysis
Co-Investigator (COI)
2020
$135.0K
Active
Thermodynamic Origins of Refractory Dust in the Early Solar System and Ancient Stars
Principal Investigator (PI)
2019
$1.0M
Active
Following the Molecular History of Stellar Ejecta: Combining Observations with Laboratory Spectroscopy and Imaging
Co-Investigator (COI)
2019
$624.9K
Active
Atomic-scale Analysis of Samples Returned from the Hayabusa Mission and Analogs of Those to-be-Returned by Hayabusa 2 and OSIRIS-Rex
Principal Investigator (PI)
2018
$815.0K
Active
Tracing the History of Molecular Phosphorus: From Interstellar Space to Planetary Surfaces
Co-Investigator (COI)
2018
$530.0K
Active

Constraining Asteroidal Formation and Alteration Conditions via Microstructure and Elemental Compositions of Sulfides from Returned Samples
Principal Investigator (PI)
2017
$125.9K
Active

News

Solar system 'detectives' search for clues in 'crumbs' left over from early solar system
2023
Dying stars could seed interstellar medium with carbon nanotubes
2022
Researchers Trace Dust Grain's Journey Through Newborn Solar System
2021
Ashes of a Dying Star Hold Clues about Solar System's Birth
2019
Ion Beams and Atom Smashers: Secrets of Moon Rocks
2019
UA Planetary Scientist Wins Bid to Study Moon Samples
2019
Mysteries Behind Interstellar Buckyballs Finally Answered
2019
Stellar Corpse Reveals Clues to Missing Stardust
2018
UA Has the Tools to Analyze Asteroid's Dirt
2017
UA in the Running for a New NASA Mission
2017
UA to Join 'A-Team' in Search for Earthlike Planets
2015
Microscopic Findings, Astronomic Implications
2015

Frozen Comet Had a Watery Past, UA Scientists Find
2011

Publications (149)

Recent

Transmission Electron Microscopy Study of a Presolar Silicate from the Miller Range 07687 Chondrite
2022
Effect of Space Weathering on the Iron Oxidation State of Ryugu Samples, a STEM-EELS Study
2022
Development of Hibonite as a Barometer for Nebular Oxygen Fugacity
2022
Condensation Phase Diagram of Ultra-Refractory Materials Pertaining to the High Temperature Region of Early Solar Protoplanetary Disk
2022
Alteration of P-Bearing Phases in Allan Hills 77307 and Murchison Meteorites
2022
Mineralogy and Space Weathering of Fine Fraction Recovered from Asteroid (162173) Ryugu
2022
NaCl in an Itokawa Particle: Terrestrial or Asteroidal?
2022
A Transmission Electron Microscopy Study of a Refractory Metal Grain from a Calcium-Aluminum-Rich Inclusion in the Leoville CV3 Chondrite
2022
From Source to Surface: An Investigation of Magmatic Lunar Volatiles
2022
First-Principles Thermodynamic of Ultra-Refractory Inclusions: Condensation Temperature of Allendeite
2022
A Multifaceted Approach to Investigating the Magmatic and Post-Magmatic History of Volatiles in Basalts from the Rim of Steno Crater
2022
Pentlandite in Chondrites: A Compositional Indicator of Oxygen Fugacity
2022
Experimental Insights into the Formation of Fullerenes and Carbon Nanotubes in Interstellar Space
2022
Dehydration Decomposition of Phyllosilicates in the C-Type Asteroid Ryugu Material by Space Weathering
2022
In-situ Formation of Halite in the Sidi El Habib 001 Ordinary Chondrite
2022
Evidence for Micrometeoroid Bombardment on the Surface of Asteroid Ryugu
2022
Measuring the Oxidation State of Sulfur in Apatites in Thin Sections of Meteorites versus Apollo Rocks
2022
Formation of Fe Whiskers Through Simulated Micrometeoroid Bombardment
2022
Tarda and Tagish Lake: Samples from the Same Outer Solar System Asteroid?
2022
Chronology of Steno Crater Basalts
2022
Transmission Electron Microscopy Study of a Presolar Silicate Grain from the Uniquely Altered Miller Range 07687 Chondrite
2021
Multistage Non-Equilibrium Processes Recorded by a Hibonite Grain in the Northwest Africa 5028 CR2 Chondrite
2021
Thermodynamic Modeling of Equilibrium Solubilities of Ti in Minerals of Calcium-and-Aluminum-Rich Inclusions Under Nebular Conditions
2021
A Microstructural Examination of a Refractory-Siderophile Nugget from the Northwest Africa 8323 CV3 Chondrite
2021
The Fe/S Ratio of Pyrrhotite Group Sulfides in Chondrites is Related to the Degree of Oxidation
2021
Apollo Sample 64455: Petrologic and Geochemical Characterization of a Glass-Coated Impact Melt Rock
2021
Unusual C, N, O Isotopic Ratios in Planetary Nebulae
2021
The Oxidation State of Sulfur in Apollo Samples 71035 and 71055
2021
Microstructural Analysis of a Sulfide Grain in the Matrix of the Sutter's Mill CM-Like Carbonaceous Chondrite
2021
Microstructural Analysis of a Refractory-Siderophile Grain, Found in a Calcium-Aluminum-Rich Inclusion
2020
The Fe/S Ratio of Pyrrhotite in Carbonaceous Chondrites Relevant to Bennu and Ryugu: An Indicator of Parent Asteroid Aqueous and Thermal Alteration
2020
3D Microstructural and Microanalytical Analyses of Wark-Lovering Rims in the Allende Meteorite
2020
The effects of secondary processing in the unique carbonaceous chondrite Miller Range 07687
2020
An in situ investigation on the origins and processing of circumstellar oxide and silicate grains in carbonaceous chondrites
2020
Author Correction: Shape of (101955) Bennu indicative of a rubble pile with internal stiffness
2020
Investigating the Magmatic History of Volatiles in Apollo 17 Basalts, Apollo Next Generation Sample Analysis
2020
Isotopic and Microstructural Analyses of Opaque Mineral Assemblages and Their Alteration Products Hosted in a Refractory Inclusion
2020
Structure and Chemistry of a Supernova Orthopyroxene Grain in the CO Chondrite Dominion Range 08006
2020
The Microstructures of Sulfide Grains from the Vic\^encia LL3.2, Hamlet LL4, and Appley Bridge LL6 Chondrites
2020
The Thermodynamics of Sc- and Ti-Bearing Refractory Mineral Phases in Calcium-Aluminum-Rich Inclusions: Revisiting the Condensation Sequence of Early Solar Nebula
2020
Putting Planetary Materials into the Gap: Insights into Planetary and Stellar Processes from in Situ Measurements in the TEM
2020
Thermodynamic Modeling of Pyroxene Solid Solutions: Revisiting the Condensation Sequence of Refractory Minerals in Calcium- and Aluminium-Rich Inclusions
2019
A Preliminary Search for Presolar Grains in a New Acid Residue of the Tagish Lake Meteorite
2019
Thermodynamics of Twin Complexions in Spinel: Deducing the Loci of Temperature and Pressure of Deformation Processes Within the Solar Protoplanetary Disk
2019
Simulating Space Weathering in the Transmission Electron Microscope via Dynamic In Situ Heating and Helium Irradiation of Olivine
2019
Microstructural Analysis of a Compact Type-A Calcium-Aluminum Rich Inclusion in the Northwest Africa (NWA) 5028 CR2 Chondrite
2019
In Situ Irradiation and Heating of Synthetic SiC and Implications for the Origins of C-Rich Circumstellar Materials
2019
Laboratory evidence for co-condensed oxygen- and carbon-rich meteoritic stardust from nova outbursts
2019
The CAESAR New Frontiers Mission: 1. Expected Nature of the Returned Comet Sample
2019
Overview of the Comet Astrobiology Exploration Sample Return (CAESAR) New Frontiers Mission
2019
Formation of Interstellar C$_60$ from Silicon Carbide Circumstellar Grains
2019
Elemental Composition and Microstructure of a Supernova Polycrystalline Olivine Aggregate in the CO Chondrite Dominion Range 08006
2019
Comparison of the Sulfide-Bearing Hayabusa Particles RB-CV-0234 and RB-QD04-0039 to LL Chondrite Sulfides
2019
A Large Donut-Shaped Presolar Silicate from the MIL 07687 Carbonaceous Chondrite
2019
Petrographic and compositional indicators of formation and alteration conditions from LL chondrite sulfides
2019
Determining the Geothermometry of a Hayabusa-Returned Sulfide Particle
2019
Thermal Alteration of Organics and Volatiles in Carbonaceous Chondrites: Insights from In-Situ Heating Experiments
2019
Lunar Landscape Evolution and Space Weathering
2019
Extreme $^13$C,$^15$N and $^17$O isotopic enrichment in the young planetary nebula K4-47
2018
The CAESAR New Frontiers Mission: 2. Sample Science
2018
Presolar silicates in the matrix and fine-grained rims around chondrules in primitive CO3.0 chondrites: Evidence for pre-accretionary aqueous alteration of the rims in the solar nebula
2018
Nanoscale Analysis of a Metal-Perovskite Assemblage in the Northwest Africa 5028 CR2 Chondrite
2018
Transmission Electron Microscope Analysis of a Spinel-Perovskite Assemblage Within a Refractory Inclusion from the Northwest Africa (NWA) 5028 CR2 Chondrite
2018
Coordinated EBSD and TEM Analysis to Decipher Shock Deformation Effects in the Oldest Solids in the Solar System
2018
Toward Quantification of Ti-Oxidation States in Planetary Materials via Application of the EELS White-Line Ratio Technique
2018
Mass-Thickness Measurements in the TEM via EDS: A New Approach to Quantitative Chemical Analysis of Planetary Materials?
2018
TEM Analysis of Presolar Silicate Grain in the Dominion Range 08006, CO Chondrite
2018
Microstructure and Inclusions of In-Situ and Acid-Residue Presolar Graphite Grains
2018
Mineralogy and 15N-Rich Organic Matter in the Fine-Grained Antarctic Micrometeorite T98G8: Evidence for a Cometary Origin?
2018
Aberration-corrected STEM/TEM Chemical Analysis and Imaging of Meteoritic Refractory Oxide Assemblages
2018
Coordinated Microanalysis of Phosphates in Apollo 11 High-Titanium Basalts
2018
Multi-keV Analyses of a Presolar Mg-Silicate Grain via SEM/STEM
2018
Electron Backscatter Diffraction Analysis of the Earliest-Formed Solids in the Solar System
2018
The CAESAR New Frontiers Comet Sample Return Mission
2018
Coordinated Microanalysis of Phosphates in High-Titanium Lunar Basalts
2018
Nanoscale Investigation of Thermal Alteration of Chondritic Meteorites via Simultaneous Secondary and Transmitted Electron Imaging during In Situ Heating up to 1000 oC
2018
Pyrrhotite and Pentlandite in LL3 to LL6 Chondrites: Determining Compositional and Microstructural Indicators of Formation Conditions
2018
Transmission Electron Microscope Analysis of High Temperature Rims Around Type-B CAIs
2018
The CAESAR New Frontiers Mission: 5. Contamination, Recovery, and Curation
2018
In Situ Heating Experiments on Patina Coated Lunar Rock 76015
2018
Low-Voltage Energy-Dispersive X-ray Spectroscopy and Electron Energy-Loss Spectroscopy Analysis of Presolar Graphite Spherules
2018
TEM Analysis of Space Weathering Features in an Itokawa Soil Grain with a Polyphasic Mineralogy
2017
Collection Efficiency of the Twin EDS Detectors for Quantitative X-ray Analysis on A New Probe-Corrected TEM/STEM
2017
Microstructure Analysis of a Soil Grain Returned from Asteroid Itokawa
2017
Electron Back-Scattered Diffraction Analysis of a Refractory Inclusion and Its Wark-Lovering Rims
2017
Nanoscale Analysis of Perovskite Grains from Allende and Axtell Meteorites
2017
In situ experimental formation and growth of Fe nanoparticles and vesicles in lunar soil
2017
A New Core Facility For Electron And Ion Microscopy At The University Of Arizona
2017
Pre-Accretionary Aqueous Alteration of Dust in Fine-Grained Chondrule Rims: Evidence from Presolar Grain Abundances and Mineralogy in Primitive CO3.0 Chondrites
2017
The Structure and Electronic States of Self-Assembled C60 Crystals
2017
Investigation of the Nature of Capping Layer Materials for FIB-SEM Preparation: Implications for the Study of Carbonaceous Material in Extraterrestrial Samples
2017
In situ Thermal Shock of Lunar and Planetary Materials Using A Newly Developed MEMS Heating Holder in A STEM/SEM
2017
A Combined Atomic-Resolution STEM and First-Principles Approach Towards Understanding the Origins of the First Solar-System Solids
2017
Correlated Isotopic Anomalies Associated with Organic Matter in Meteorites
2017
Origins and Delivery of Volatile Elements in Terrestrial Planets: Insight from the Composition and Functional Chemistry of Organic Matter in Meteorites
2017
Coordinated X-ray, Ion, and Electron Microanalysis Approach Towards Understanding the Earliest-Formed Solids in the Solar System
2017
Nitrogen and Carbonaceous Isotopic Variations in Several Carbonaceous Chondrites {\mdash} A Hunt for the Carrier Phases
2016
Microstructural analysis of Wark-Lovering rims in the Allende and Axtell CV3 chondrites: Implications for high-temperature nebular processes
2016
Sensing Biosignatures Within Rocks of the Atacama Desert {\mdash} An Analog for Mars Environments
2016
Auger Spectroscopy Analysis of Submicron-Sized Silicate Grains in Chondrites: Insight into Their Aqueous and Thermal Alteration History
2016
Copper Sulfides in the R Chondrites: Evidence of Hydrothermal Alteration in Low Petrologic Types
2016
Atomic-Resolution Analysis of Perovskite from the Early Solar System
2016
Nanostructural Analysis of Several Perovskite Grains from an Allende CAI: Evidence for Equilibrium or Non-Equilibrium Condensation?
2016
In Situ Heating of Lunar Soil in the Transmission Electron Microscope: Simulating Micrometeorite Impacts.
2016
Circumstellar Magnetite from the LAP 031117 CO3.0 Chondrite
2015
The formation and alteration of the Renazzo-like carbonaceous chondrites III: Toward understanding the genesis of ferromagnesian chondrules
2015
Identification of Circumstellar Magnetite in the LAP 031117 CO3.0 Chondrite
2015
Simulation of Micrometeorite Impacts Through In Situ Dynamic Heating of Lunar Soil
2015
The Oxidation State of Fe Nanoparticles in Lunar Soil: Implications for Space Weathering Processes
2015
Abundances and Elemental Compositions of Presolar Silicates in CO3.0 Chondrites: Possible Indicators of Secondary Processing?
2015
Circumstellar Magnetite Identified in the LAP 031117 CO3.0 Chondrite
2015
The Oxidation State of Nanophase Fe Particles in Lunar Soil: Implications for Space Weathering
2015
A transmission electron microscopy study of presolar spinel
2014
A computational investigation of adsorption of organics on mineral surfaces: Implications for organics delivery in the early solar system
2014
Electron Energy-Loss Spectroscopy of Iron Nanoparticles in Lunar Soil using an Aberration-Corrected Scanning Transmission Electron Microscope.
2014
Spatial Variation of Presolar Silicate Abundances in CO3 Chondrites: Correlation with Aqueous Alteration?
2014
Testing variations within the Tagish Lake meteorite—I: Mineralogy and petrology of pristine samples
2014
Assessment of alteration processes on circumstellar and interstellar grains in Queen Alexandra Range 97416
2014
Microchemical and structural evidence for space weathering in soils from asteroid Itokawa
2014
A Comparative Study of Electron Energy-Loss Spectroscopy (EELS) and X-ray Absorption Near Edge Structure (XANES) Spectroscopy for Probing the Oxidation State of Transition Metals in Planetary Materials
2014
Isotopic and chemical variation of organic nanoglobules in primitive meteorites
2013
Measurements of the Oxidation State of Ti in Calcium Aluminate from the Early Solar System and Ancient Stars
2012
Brearleyite, Ca sub 12 /sub Al sub 14 /sub O sub 32 /sub Cl sub 2 /sub , a new alteration mineral from the NWA 1934 meteorite
2011
Size and temperature dependence of band-edge excitons in PbSe nanowires
2011
Synthesis of PbSe nanowires: The impact of alkylphosphonic acid addition
2011
A transmission electron microscopy study of presolar hibonite
2011
Band-edge excitons in PbSe nanocrystals and nanorods
2010
Isotopic anomalies in organic nanoglobules from Comet 81P/Wild 2: Comparison to Murchison nanoglobules and isotopic anomalies induced in terrestrial organics by electron irradiation
2010
Mineral associations and character of isotopically anomalous organic material in the Tagish Lake carbonaceous chondrite
2010
Ultra-primitive interplanetary dust particles from the comet 26P/Grigg-Skjellerup dust stream collection
2009
Nanobeam analysis of the oxidation states of transition metals in primitive planetary materials
2008
A TEM study of thermally modified comet 81P/Wild 2 dust particles by interactions with the aerogel matrix during the Stardust capture process
2008
Structural, chemical and isotopic examinations of interstellar organic matter extracted from meteorites and interstellar dust particles
2008
Comparing Wild 2 particles to chondrites and IDPs
2008
Oxygen reduction reaction on platinum/tantalum oxide electrocatalysts for PEM fuel cells
2007
Dislocations in III-nitride films grown on 4H-SiC mesas with and without surface steps
2007
Coordinated isotopic and mineralogic analyses of planetary materials enabled by in situ lift-out with a focused ion beam scanning electron microscope
2007
Determination of interface atomic structure and its impact on spin transport using Z-contrast microscopy and density-functional theory
2006
Mineralogy and petrology of comet 81P/wild 2 nucleus samples
2006
In situ lift-out for coordinated structure-electron transport and structure-isotope studies
2006
Comet 81P/wild 2 under a microscope
2006
Z-contrast-microscopy and density-functional-theory determination of the atomic structure of the Fe/AlGaAs interface and its impact on spin transport
2006
Polyhedral serpentine grains in CM chondrites
2006
Serpentine nanotubes in the Mighei CM chondrite
2004
Nanometer-scale measurements of Fe sup 3+ /sup /ΣFe by electron energy-loss spectroscopy: A cautionary note
2004
Effects of the heteroepitaxial interface on spin injection in Fe/AlGaAs
2004
Erratum: Serpentine nanotubes in the Mighei CM chondrite (Earth and Planetary Science Letters (2004) vol. 223 (141-146) 10.1016/j.epsl.2004.04.005)
2004
Fine-grained-rim mineralogy of the Cold Bokkeveld CM chondrite
2003

Nanometer-scale measurements of iron oxidation states of cronstedtite from primitive meteorites
2003

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Publications (149)