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Search Publications by: Joseph T. Hodges (Fed)

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Displaying 1 - 25 of 217

Contributions of argon, nitrogen, and oxygen to air broadening in the oxygen A-band

April 16, 2025
Author(s)
Leah Stevenson, Mitchio Okumura, Joseph Hodges, Erin Adkins
The oxygen (O2) A-band is used to determine the air mass in ground- and space-based remote sensing measurements because the O2 mixing ratio in Earth's atmosphere is constant. Because errors in the retrieved air mass propagate to measurements of target gas

New beyond-Voigt line-shape pro le recommended for the HITRAN database

March 27, 2025
Author(s)
Piotr Wcislo, N. Stolarczyk, M. Slowinski, H. Jozwiak, Daniel Lisak, R. Ciurylo, A. Cygan, F. Schreier, C.D. Boone, A. Castrillo, L. Gianfrani, Y. Tan, S-M. Hu, Erin Adkins, Joseph Hodges, H. Tran, H.N. Ngo, J.M- Hartmann, A. Campargue, S. Beguier, R.J. Hargreaves, L.S. Rothman, I.E. Gordon
Parameters associated with the collisional perturbation of spectral lines are essential for modeling the absorption of electromagnetic radiation in planetary atmospheres. The HITRAN molecular spectroscopic database provides these parameters, although

An Accurate Determination of O2 A-band Line Intensities through Experiment and Theory

February 27, 2025
Author(s)
Erin Adkins, Sergei Yurchenko, Wilfrid Somogyi, Joseph Hodges
Accurate intensities of the O2 A-band 〖[b〗^1 Σ_g^+⟵X^3 Σ_g^- (0,0)] centered about 760 nm are essential to reduce biases in satellite- and ground-based remote measurements of column-integrated air mass and greenhouse gas concentration. In support of these

International Comparison CCQM-P229: Pilot Study to Measure Absolute Line Intensities of Selected 12C16O Transitions

January 24, 2025
Author(s)
Joseph Hodges, Zachary Reed, Katarzyna Bielska, Manfred Birk, Ruimin Guo, Gang Li, Jeong Sik Lim, Daniel Lisak, Georg Wagner
We present primary spectroscopic measurements of line intensities in the 3-0 vibrational band of 12C16O. This international measurement campaign was organized under the auspices of the Consultative Committee for Amount of Substance (CCQM) and involved six

The 3-0 Quadrupole Band in H2 by Cavity Ring-Down Spectroscopy

October 12, 2021
Author(s)
D C. Robie, Joseph T. Hodges
Several lines in the S and Q branches (including the previously unobserved Q32 and Q33 lines) of the 3-0 quadrupole band of H2 have been detected by cavity ring-down spectroscopy using a multimode laser with a long cavity. The noise equivalent absorption

Pilot Comparison CCQM-P177 - Monoterpenes in Nitrogen at 2.5 nmol mol-1 Final Report

September 27, 2021
Author(s)
Christina Cecelski, George C. Rhoderick, Joseph T. Hodges, Antonio Possolo, Olaf Wilke
The growing awareness of climate change, and continuing concerns regarding tropospheric and stratospheric chemistry, will require future measurements and standards for compounds linked to these issues. To globally monitor and control the emissions of these

Improvement of the spectroscopic parameters of the air- and self-broadened N2O and CO lines for the HITRAN2020 database applications

June 11, 2021
Author(s)
Robab Hashemi, Iouli Gordon, Erin Adkins, Joseph T. Hodges, Manfred Birk, David Long, Chris Boone, Adam Fleisher, Adriana Predoi-Cross, Laurence Rothman
This paper outlines the major update of the line-shape parameters that were performed for the nitrous oxide (N2O) and carbon monoxide (CO) molecules listed in the HITRAN2020 database. We reviewed the collected measurements for the air- and self-broadened

Comparison of primary laser spectroscopy and mass spectrometry methods for measuring mass concentration of gaseous elemental mercury

December 10, 2020
Author(s)
Abneesh Srivastava, Stephen E. Long, James E. Norris, Colleen E. Bryan Sallee, Jennifer Carney, Joseph Hodges
We present a direct comparison between two independent methods for the measurement of gaseous elemental mercury (GEM) mass concentration: isotope dilution cold-vapor inductively coupled plasma mass spectrometry (ID-CV-ICP-MS) and laser absorption
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