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Adam J. Fleisher (Fed)
Project Leader, Research Chemist
Adam J. Fleisher is a Project Leader and Research Chemist at the National Institute of Standards & Technology (NIST) in Gaithersburg, MD, USA. His research is in precision molecular spectroscopy, currently applied to measurements of isotopic composition, trace gas impurities, plasmas, and line lists for astrophysics and astrochemistry. The work yields accurate absorption cross-sections to benchmark quantum chemistry calculations, an important step in the determination of absolute isotope ratios and reliable line lists. In the laboratory, this requires the development of advanced optical sensing techniques using frequency combs, mid- and far-infrared quantum-cascade lasers, stabilized near-infrared lasers, high-finesse optical resonators, and new high-speed spectrometers.
Prior to joining NIST in Gaithersburg, AJ Fleisher was a National Research Council (NRC) postdoc at JILA (University of Colorado Boulder and NIST) in the group of Jun Ye. He earned his Ph.D. from the University of Pittsburgh working with David Pratt, and completed his undergraduate studies at Elizabethtown College.
AJ Fleisher is an Optica Ambassador, recognized as an emerging leader in the optics and photonics community. He routinely serves on the organizing committees for several optical sensing and spectroscopy meetings and was the lead guest editor on two Joint Feature Issues of Optics Express and Applied Optics.
Standards engagement activities include participation in the Consultative Committee for Amount of Substance: Metrology in Chemistry and Biology (CCQM) Gas Analysis Working Group (GAWG) and Isotope Ratio Working Group (IRWG) at the International Bureau of Weights and Measures (BIPM). Recently, he has taken leadership of the Advanced Spectroscopy Task Group within the GAWG, and championed research at NIST on U.S. national priorities like standards for critical and emerging technology areas and the CHIPS for America Act.
Click here to see Dr. Fleisher’s Google Scholar page
Research Opportunities
- NRC Postdoc opportunities at NIST in Gaithersburg, Maryland, USA
- “Time-Resolved Frequency Comb Spectroscopy”
- “Ultra-Sensitive Molecular Spectroscopy for Applications in Atmospheric Chemistry”
Publication Highlights
- “The isotopic composition of VPDB,” IUPAC News Release (2024).
- Top 25 Physics Articles of 2023, Nature Communications (2024).
- “Detangling light-based thermometers with combs,” NIST Research Highlight, Jennifer Lauren Lee (2023).
- “Crystalline supermirrors cut optical losses,” Physics World (IOP), Isabelle Dumé (2021).
- Editors’ Pick: Optics Express 29, 26831–26840 (2021).
- Editors’ Pick: Optics Letters 44, 4415–4418 (2019).
- “Corrections promise more accurate CO2 measurements from space,” Chemistry World (RSC), Andy Extance (2019).
- “Synopsis: Correcting hardware bias in molecular spectrometer,” Physics (APS), Marric Stephens (2019).
- Editors’ Suggestion: Physical Review Letters 123, 043001 (2019).
- “A benchtop test for biofuel authenticity,” Chemical & Engineering News (ACS), Deirdre Lockwood (2017).
- “A new method for identifying carbon compounds derived from fossil fuels,” NIST News, Rich Press (2017).
- JCP Editors’ Choice, Journal of Chemical Physics, 2009.
