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Laskowski MR, Michael TJ, Ogden HM, Alexander MH, Mullin AS. Rotational energy transfer kinetics of optically centrifuged CO molecules investigated through transient IR spectroscopy and master equation simulations. Faraday Discuss 2022; 238:87-102. [DOI: 10.1039/d2fd00068g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combined experimental and theoretical study of quantum state-resolved rotational energy transfer kinetics of optically centrifuged CO molecules is presented. In the experiments, inverted rotational distributions of CO in rotational...
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Michael TJ, Ogden HM, Mullin AS. State-resolved rotational distributions and collision dynamics of CO molecules made in a tunable optical centrifuge. J Chem Phys 2021; 154:134307. [PMID: 33832253 DOI: 10.1063/5.0038372] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
State-resolved distributions and collision dynamics of optically centrifuged CO molecules with orientated angular momentum are investigated by probing the CO J = 29-80 rotational levels using high-resolution transient IR absorption spectroscopy. An optical centrifuge with tunable bandwidth is used to control the extent of rotational excitation in the sample. The rotational distributions are inverted with a maximum population in J = 62. Rotational levels with J > 62 have populations that correlate with the intensity profile of the optical trap. The full bandwidth trap excites CO up to the J = 80 level, while J = 67 is the highest level observed in the reduced bandwidth trap. Polarization-sensitive transient spectroscopy shows that the initial orientational anisotropy is r = 0.8 for levels with J ≥ 55, while anisotropy values are near r = 0.4 for levels with J < 50. The rotational distribution for J > 50 is broadened slightly by collisions, consistent with small |ΔJ| propensity rules for rotational energy transfer. Doppler-broadened line profiles show that the J = 60-80 levels have translational temperatures near Ttrans = 300 K and that these temperatures remain constant for as much as 24 gas kinetic collisions. Doppler linewidths for levels with J < 60 are broadened by non-resonant rotation-to-translation energy transfer. Kinetic analysis of transient signals shows that collisions with thermal bath molecules are the predominant relaxation pathway.
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Affiliation(s)
- Tara J Michael
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Hannah M Ogden
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Amy S Mullin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
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Murray MJ, Ogden HM, Mullin AS. Importance of rotational adiabaticity in collisions of CO2 super rotors with Ar and He. J Chem Phys 2018; 148:084310. [DOI: 10.1063/1.5009440] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Matthew J. Murray
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Hannah M. Ogden
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
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Murray MJ, Ogden HM, Toro C, Liu Q, Mullin AS. Impulsive Collision Dynamics of CO Super Rotors from an Optical Centrifuge. Chemphyschem 2016; 17:3692-3700. [DOI: 10.1002/cphc.201600871] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 09/28/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Matthew J. Murray
- Department of Chemistry and Biochemistry University of Maryland College Park MD USA
| | - Hannah M. Ogden
- Department of Chemistry and Biochemistry University of Maryland College Park MD USA
| | - Carlos Toro
- Department of Chemistry and Biochemistry University of Maryland College Park MD USA
| | - Qingnan Liu
- National Institute of Standards and Technology 100 Bureau Drive, Stop 8320 Gaithersburg MD 20899 USA
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry University of Maryland College Park MD USA
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Murray MJ, Ogden HM, Toro C, Liu Q, Burns DA, Alexander MH, Mullin AS. State-Specific Collision Dynamics of Molecular Super Rotors with Oriented Angular Momentum. J Phys Chem A 2015; 119:12471-9. [DOI: 10.1021/acs.jpca.5b07941] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew J. Murray
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Hannah M. Ogden
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Carlos Toro
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Qingnan Liu
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - David A. Burns
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Millard H. Alexander
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Amy S. Mullin
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
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