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Title: Doppler-resolved kinetics of saturation recovery

Abstract

Frequency modulated laser transient absorption has been used to monitor the ground state rotational energy transfer rates of CN radicals in a double-resonance, depletion recovery experiment. When a pulsed laser is used to burn a hole in the equilibrium ground state population of one rotational state without velocity selection, the population recovery rate is found to depend strongly on the Doppler detuning of a narrow-band probe laser. Similar effects should be apparent for any relaxation rate process that competes effectively with velocity randomization. Alternative methods of extracting thermal rate constants in the presence of these non-thermal conditions are evaluated. Total recovery rate constants, analogous to total removal rate constants in an experiment preparing a single initial rotational level, are in good agreement with quantum scattering calculations, but are slower than previously reported experiments and show qualitatively different rotational state dependence between Ar and He collision partners. As a result, quasi-classical trajectory studies confirm that the differing rotational state dependence is primarily a kinematic effect.

Authors:
 [1];  [1];  [1];  [2];  [3];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. John Hopkins Univ., Baltimore, MD (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1183291
Report Number(s):
BNL-107780-2015-JA
Journal ID: ISSN 1089-5639; R&D Project: CO006; KC0301020
Grant/Contract Number:  
SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory
Additional Journal Information:
Journal Volume: 119; Journal Issue: 28; Journal ID: ISSN 1089-5639
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; speed-dependent relaxation; doppler velocity selection; non-thermal kinetics; CN radical; rotational energy transfer; molecular dynamics

Citation Formats

Forthomme, Damien, Hause, Michael L., Yu, Hua -Gen, Dagdigian, Paul J., Sears, Trevor J., and Hall, Gregory E. Doppler-resolved kinetics of saturation recovery. United States: N. p., 2015. Web. doi:10.1021/acs.jpca.5b00628.
Forthomme, Damien, Hause, Michael L., Yu, Hua -Gen, Dagdigian, Paul J., Sears, Trevor J., & Hall, Gregory E. Doppler-resolved kinetics of saturation recovery. United States. https://doi.org/10.1021/acs.jpca.5b00628
Forthomme, Damien, Hause, Michael L., Yu, Hua -Gen, Dagdigian, Paul J., Sears, Trevor J., and Hall, Gregory E. Wed . "Doppler-resolved kinetics of saturation recovery". United States. https://doi.org/10.1021/acs.jpca.5b00628. https://www.osti.gov/servlets/purl/1183291.
@article{osti_1183291,
title = {Doppler-resolved kinetics of saturation recovery},
author = {Forthomme, Damien and Hause, Michael L. and Yu, Hua -Gen and Dagdigian, Paul J. and Sears, Trevor J. and Hall, Gregory E.},
abstractNote = {Frequency modulated laser transient absorption has been used to monitor the ground state rotational energy transfer rates of CN radicals in a double-resonance, depletion recovery experiment. When a pulsed laser is used to burn a hole in the equilibrium ground state population of one rotational state without velocity selection, the population recovery rate is found to depend strongly on the Doppler detuning of a narrow-band probe laser. Similar effects should be apparent for any relaxation rate process that competes effectively with velocity randomization. Alternative methods of extracting thermal rate constants in the presence of these non-thermal conditions are evaluated. Total recovery rate constants, analogous to total removal rate constants in an experiment preparing a single initial rotational level, are in good agreement with quantum scattering calculations, but are slower than previously reported experiments and show qualitatively different rotational state dependence between Ar and He collision partners. As a result, quasi-classical trajectory studies confirm that the differing rotational state dependence is primarily a kinematic effect.},
doi = {10.1021/acs.jpca.5b00628},
journal = {Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory},
number = 28,
volume = 119,
place = {United States},
year = {Wed Apr 08 00:00:00 EDT 2015},
month = {Wed Apr 08 00:00:00 EDT 2015}
}

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