Academic Appointments


  • Physical Science Research Scientist, Mechanical Engineering

All Publications


  • Experimental Measurement of the Rate Coefficient for OCS + M, with M = Ar, He, N2, CO2 in a Shock Tube Using Laser Absorption Spectroscopy. The journal of physical chemistry. A Panda, A., Biswas, P. A., Simitz, L. V., Streicher, J. W., Strand, C. L., Hanson, R. K. 2026

    Abstract

    A comprehensive understanding of sulfur chemistry is crucial for the characterization and modeling of planetary atmospheres. The unimolecular decomposition of carbonyl sulfide (OCS + M = CO + S + M) is a critical reaction for the development of accurate photochemical models. In this study, we employ laser absorption spectroscopy (LAS)-based diagnostics in a shock tube to investigate the rate coefficient of OCS decomposition. Sensitive and interference-free diagnostics were developed to monitor OCS depletion at 2070.858 cm-1 and CO formation at 2115.628 cm-1. The reaction rate coefficient of OCS decomposition was measured over a temperature range of 1800-2500 K. This work represents the first experimental determination of OCS decomposition rates in bath gases pertinent to several planetary environments (i.e., He, N2, and CO2). Additionally, we characterize the pressure dependence of the reaction rate through measurements at 1, 2, and 8 atm. The rate constant measured at 2 atm for argon, k1,Ar, aligns with previous studies and is given by k1,Ar = 3.48 × 10-10 exp (-257kJ/RT) cm3 molecule-1 s-1. The relative Chaperone efficiencies at 2 atm were determined as k1,He/k1,Ar = 2.68, k1,N2/k1,Ar = 1.85, and k1,CO2/k1,Ar = 3.67 through our experiments. Our results provide new insights into OCS kinetics, marking the first systematic study of its pressure-dependent behavior in exoplanetary-relevant conditions. These findings, underscored by low experimental uncertainties (±9.0% for k1,Ar, ±12% for k1,He, ±18% for k1,N2, and ±24% for k1,CO2) reflect high-quality, repeatable measurements that will support sulfur chemistry atmospheric modeling and enhance the interpretation of spectroscopic observations from missions such as the James Webb Space Telescope (JWST).

    View details for DOI 10.1021/acs.jpca.5c07383

    View details for PubMedID 41608828

  • Laser Absorption Spectroscopy Studies of the Cyano Radical for Titan Entry Kinetics JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER Chang, E., Merrell, D. P., Streicher, J. W., Hanson, R. K. 2026

    View details for DOI 10.2514/1.T7358

    View details for Web of Science ID 001666860400001

  • Vibrational-state-resolved relaxation and chemistry of carbon monoxide and nitrogen mixtures from 2000-10 250 K probing carbon monoxide in the ground to twelfth excited vibrational levels (vol37, 096112 , 2025) PHYSICS OF FLUIDS Streicher, J. W., Merrell, D. P., Strand, C. L., Hanson, R. K., Aiken, T. T., Andrienko, D. A., Boyd, I. D. 2025; 37 (12)

    View details for DOI 10.1063/5.0311187

    View details for Web of Science ID 001633845000014

  • Ring-amplified shock tube for variable-gain, multi-wavelength absorption spectroscopy OPTICS EXPRESS Strand, C. L., Merrell, D., Thoeny, A., Streicher, J. W., Hanson, R. K. 2025; 33 (20): 42653-42676

    View details for DOI 10.1364/OE.571994

    View details for Web of Science ID 001589698900008

  • Vibrational-state-resolved relaxation and chemistry of carbon monoxide and nitrogen mixtures from 2000-10 250 K probing carbon monoxide in the ground to twelfth excited vibrational levels PHYSICS OF FLUIDS Streicher, J. W., Merrell, D. P., Strand, C. L., Hanson, R. K., Aiken, T. T., Andrienko, D. A., Boyd, I. D. 2025; 37 (9)

    View details for DOI 10.1063/5.0290858

    View details for Web of Science ID 001564242200016

  • A laser-absorption diagnostic for O<sub>2</sub> concentration and temperature using a portable, tunable UV laser system APPLIED PHYSICS B-LASERS AND OPTICS Barnes, S. C., Clees, S., Vandervort, J. A., Rault, T. M., Streicher, J. W., Strand, C. L., Hanson, R. K. 2025; 131 (4)
  • Measurements of high-temperature H2 laminar flame speeds across a wide range of pressure and Ar dilution for improved comparative evaluation of chemical kinetic models INTERNATIONAL JOURNAL OF HYDROGEN ENERGY Figueroa-Labastida, M., Zheng, L., Streicher, J. W., Hanson, R. K. 2025; 102: 411-429
  • Development and demonstration of a two-color nitric oxide vibrational temperature diagnostic using spectrally-resolved ultraviolet laser absorption JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Barnes, S. C., Streicher, J. W., Krish, A., Hanson, R. K. 2025; 332
  • A shock tube study of chaperon efficiencies for the NH3+M-NH2+H + M reaction during ammonia pyrolysis PROCEEDINGS OF THE COMBUSTION INSTITUTE Simha, P., Rault, T. M., Clees, S., Streicher, J. W., Strand, C. L., Hanson, R. K. 2025; 41
  • Experimental and computational assessment of O<sub>2</sub> and NO individual vibrational states in reflected shock flows Andrienko, D. A., Boyd, I. D., Streicher, J. W., Hanson, R. K., AIAA AMER INST AERONAUTICS & ASTRONAUTICS. 2025
  • Effect of elevated temperatures (550-860 K) on the laminar flame speeds of methane/hydrogen blends FUEL Figueroa-Labastida, M., Zheng, L., Streicher, J. W., Hanson, R. K. 2024; 372
  • Experimental measurements of<i> n</i>-heptane flame speeds behind reflected shock waves with variable extents of pre-flame auto-ignition chemistry COMBUSTION AND FLAME Zheng, L., Figueroa-Labastida, M., Streicher, J. W., Ferris, A. M., Hanson, R. K. 2024; 266
  • Ammonia/hydrogen laminar flame speed measurements at elevated temperatures INTERNATIONAL JOURNAL OF HYDROGEN ENERGY Figueroa-Labastida, M., Zheng, L., Streicher, J. W., Hanson, R. K. 2024; 63: 1137-1146
  • High-temperature laminar flame speed measurements of ammonia/ methane blends behind reflected shock waves COMBUSTION AND FLAME Figueroa-Labastida, M., Zheng, L., Streicher, J. W., Hanson, R. K. 2024; 261
  • Measurements of methane laminar flame speeds at temperatures up to 1320 K COMBUSTION AND FLAME Figueroa-Labastida, M., Zheng, L., Streicher, J. W., Hanson, R. K. 2024; 261
  • Measurements and a new correlation of methanol laminar flame speeds at temperatures up to 916 K and elevated pressures behind reflected shock waves PROCEEDINGS OF THE COMBUSTION INSTITUTE Zheng, L., Figueroa-Labastida, M., Streicher, J., Hanson, R. K. 2024; 40 (1-4)
  • Evaluation of thermal relaxation and extinction of nitric oxide via a master equation model Andrienko, D. A., Boyd, I. D., Streicher, J. W., Hanson, R. K., AIAA AMER INST AERONAUTICS & ASTRONAUTICS. 2024
  • Vibrational-State-Resolved Oxygen and Nitric Oxide Time-History Measurements in Shock-Heated, High-Temperature Air Streicher, J. W., Barnes, S. C., Krish, A., Hanson, R. K., AIAA AMER INST AERONAUTICS & ASTRONAUTICS. 2024
  • Demonstration of UV Rotational, Vibrational Temperature and Speciation Diagnostics for the Cyano-Radical in Methane-Nitrogen Mixtures Merrell, D. P., Chang, E., Krish, A., Finch, P. M., Streicher, J. W., Hanson, R. K., AIAA AMER INST AERONAUTICS & ASTRONAUTICS. 2024
  • Spectroscopic modeling and measurements of the CN Violet and Red systems for the development of nonequilibrium temperature and speciation diagnostics JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Krish, A., Finch, P. M., Merrell, D. P., Streicher, J. W., Hanson, R. K. 2023; 311
  • Laser absorption study of the N-2 + O -> NO plus N and NO plus O -> O-2 + N Zeldovich reactions in shock-heated N2O mixtures PHYSICS OF FLUIDS Streicher, J. W., Krish, A., Hanson, R. K. 2023; 35 (4)

    View details for DOI 10.1063/5.0147764

    View details for Web of Science ID 001003916300002

  • Shock-Tube Measurements of Atomic Nitrogen Collisional Excitation in 8000-12000 K Partially Ionized Nitrogen-Argon Mixtures. The journal of physical chemistry. A Finch, P. M., Granowitz, Z. N., Streicher, J. W., Krish, A., Strand, C. L., Hanson, R. K. 2023

    Abstract

    We report on shock-tube experiments measuring the collisional excitation of atomic nitrogen using tunable diode laser absorption spectroscopy (TDLAS). Conditions behind the reflected shocks ranged from 8000 to 12000 K and 0.1 to 1.1 atm in mixtures of 1 or 2% molecular nitrogen (N2) in argon (Ar). Absorption from the transition between atomic nitrogen quantum states 4P to 4D at 868 nm was used to monitor the formation of electronically excited nitrogen. Population measurements of the 4P state were made at a rate of 50 kHz. In connection with these measurements, a multitemperature kinetic mechanism is proposed for nitrogen excitation. Measurements suggest a multistage process. In early test times, a period of induction due to N2 dissociation is followed by a rise via heavy particle excitation. The dominant channel causing this excitation is believed to be N + N N(4P) + N with a measured forward rate constant of 3.65 * 10-18 exp(-119892/T) [m3/s]. As test time evolves, the excitation of 4P, referred to as N*, is subsequently interrupted and then resumes, as the kinetic environment becomes increasingly electron-dominated. The most impactful reactions of the mechanism are optimized to reduce the residual between simulations and the measurements. The measured N* populations indicate strong, though indirect, sensitivity to adjacent processes, including the excitation of metastable nitrogen, and ionization channels.

    View details for DOI 10.1021/acs.jpca.2c07839

    View details for PubMedID 36745871

  • Application of Reflected Shock Wave Configuration to Validate Nonequilibrium Models of Reacting Air JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER Gimelshein, S. F., Streicher, J. W., Krish, A., Hanson, R. K., Wysong, I. J. 2022

    View details for DOI 10.2514/1.T6630

    View details for Web of Science ID 000891162900001

  • High-temperature vibrational relaxation and decomposition of shock-heated nitric oxide. I. Argon dilution from 2200 to 8700 K PHYSICS OF FLUIDS Streicher, J. W., Krish, A., Hanson, R. K. 2022; 34 (11)

    View details for DOI 10.1063/5.0109109

    View details for Web of Science ID 000882457400018

  • High-temperature vibrational relaxation and decomposition of shock-heated nitric oxide: II. Nitrogen dilution from 1900 to 8200 K PHYSICS OF FLUIDS Streicher, J. W., Krish, A., Hanson, R. K. 2022; 34 (11)

    View details for DOI 10.1063/5.0122787

    View details for Web of Science ID 000882457400010

  • Spectrally-resolved ultraviolet absorption measurements of shock-heated NO from 2000 K to 6000 K for the development of a two-color rotational temperature diagnostic JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Krish, A., Streicher, J. W., Hanson, R. K. 2022; 280
  • Spectrally-resolved absorption cross-section measurements of shock-heated O-2 for the development of a vibrational temperature diagnostic JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Krish, A., Streicher, J. W., Hanson, R. K. 2021; 270
  • Coupled vibration-dissociation time-histories and rate measurements in shock-heated, nondilute O-2 and O-2-Ar mixtures from 6000 to 14000K PHYSICS OF FLUIDS Streicher, J. W., Krish, A., Hanson, R. K. 2021; 33 (5)

    View details for DOI 10.1063/5.0048059

    View details for Web of Science ID 000677502500006

  • Vibrational relaxation time measurements in shock-heated oxygen and air from 2000 K to 9000 K using ultraviolet laser absorption PHYSICS OF FLUIDS Streicher, J. W., Krish, A., Hanson, R. K. 2020; 32 (8)

    View details for DOI 10.1063/5.0015890

    View details for Web of Science ID 000559819800001

  • Shock-tube measurements of coupled vibration-dissociation time-histories and rate parameters in oxygen and argon mixtures from 5000 K to 10 000 K PHYSICS OF FLUIDS Streicher, J. W., Krish, A., Hanson, R. K., Hanquist, K. M., Chaudhry, R. S., Boyd, I. D. 2020; 32 (7)

    View details for DOI 10.1063/5.0012426

    View details for Web of Science ID 000547489500002

  • Ultraviolet absorption cross-section measurements of shock-heated O-2 from 2,000-8,400 K using a tunable laser JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Krish, A., Streicher, J. W., Hanson, R. K. 2020; 247
  • A comparative laser absorption and gas chromatography study of low-temperature n-heptane oxidation intermediates PROCEEDINGS OF THE COMBUSTION INSTITUTE Ferris, A. M., Susa, A. J., Davidson, D. F., Hanson, R. K. 2019; 37 (1): 249–57