Microwave transient nutation measurements of relaxation in OCS and NH3

J. H.S. Wang; J. M. Levy; S. G. Kukolich; J. I. Steinfeld

doi:10.1016/0301-0104(73)85006-2

Microwave transient nutation measurements of relaxation in OCS and NH₃

J. H.S. Wang, J. M. Levy, S. G. Kukolich, J. I. Steinfeld

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

The phenomenological Bloch equations are solved for transient nutation in optical two-level systems, using the Feynman-Vernon-Hellwarth representation. The resulting solutions display an exponentially damped oscillatory behavior, from which the relaxation times T₁ and T₂ may be derived. Transient nutation signals were observed using time-resolved microwave spectroscopy with rapid switching of applied Stark fields. Observed collision relaxation rates are (5.25 ± 0.50) MHz/torr for OCS-OCS, (1.96 ± 0.30) MHz/torr for OCS-He and (1.67 ± 0.20) MHz/torr for OCS-Ar. For NH₃NH₃ relaxation the rate is (23.2 ± 3.5) MHz/torr for the (8,7) inversion line.

Original language	English (US)
Pages (from-to)	141-148
Number of pages	8
Journal	Chemical Physics
Volume	1
Issue number	2
DOIs	https://doi.org/10.1016/0301-0104(73)85006-2
State	Published - 1973
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1016/0301-0104(73)85006-2

Cite this

@article{96727b93ae4c41b6952623d3c79271f5,

title = "Microwave transient nutation measurements of relaxation in OCS and NH3",

abstract = "The phenomenological Bloch equations are solved for transient nutation in optical two-level systems, using the Feynman-Vernon-Hellwarth representation. The resulting solutions display an exponentially damped oscillatory behavior, from which the relaxation times T1 and T2 may be derived. Transient nutation signals were observed using time-resolved microwave spectroscopy with rapid switching of applied Stark fields. Observed collision relaxation rates are (5.25 ± 0.50) MHz/torr for OCS-OCS, (1.96 ± 0.30) MHz/torr for OCS-He and (1.67 ± 0.20) MHz/torr for OCS-Ar. For NH3NH3 relaxation the rate is (23.2 ± 3.5) MHz/torr for the (8,7) inversion line.",

author = "Wang, {J. H.S.} and Levy, {J. M.} and Kukolich, {S. G.} and Steinfeld, {J. I.}",

note = "Funding Information: This work was supportedb y the Air Force Office of Scientific ResearchG, rant No. AFOSR-7 l-2032.",

year = "1973",

doi = "10.1016/0301-0104(73)85006-2",

language = "English (US)",

volume = "1",

pages = "141--148",

journal = "Chemical Physics",

issn = "0301-0104",

publisher = "Elsevier B.V.",

number = "2",

}

TY - JOUR

T1 - Microwave transient nutation measurements of relaxation in OCS and NH3

AU - Wang, J. H.S.

AU - Levy, J. M.

AU - Kukolich, S. G.

AU - Steinfeld, J. I.

N1 - Funding Information: This work was supportedb y the Air Force Office of Scientific ResearchG, rant No. AFOSR-7 l-2032.

PY - 1973

Y1 - 1973

N2 - The phenomenological Bloch equations are solved for transient nutation in optical two-level systems, using the Feynman-Vernon-Hellwarth representation. The resulting solutions display an exponentially damped oscillatory behavior, from which the relaxation times T1 and T2 may be derived. Transient nutation signals were observed using time-resolved microwave spectroscopy with rapid switching of applied Stark fields. Observed collision relaxation rates are (5.25 ± 0.50) MHz/torr for OCS-OCS, (1.96 ± 0.30) MHz/torr for OCS-He and (1.67 ± 0.20) MHz/torr for OCS-Ar. For NH3NH3 relaxation the rate is (23.2 ± 3.5) MHz/torr for the (8,7) inversion line.

AB - The phenomenological Bloch equations are solved for transient nutation in optical two-level systems, using the Feynman-Vernon-Hellwarth representation. The resulting solutions display an exponentially damped oscillatory behavior, from which the relaxation times T1 and T2 may be derived. Transient nutation signals were observed using time-resolved microwave spectroscopy with rapid switching of applied Stark fields. Observed collision relaxation rates are (5.25 ± 0.50) MHz/torr for OCS-OCS, (1.96 ± 0.30) MHz/torr for OCS-He and (1.67 ± 0.20) MHz/torr for OCS-Ar. For NH3NH3 relaxation the rate is (23.2 ± 3.5) MHz/torr for the (8,7) inversion line.

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DO - 10.1016/0301-0104(73)85006-2

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VL - 1

SP - 141

EP - 148

JO - Chemical Physics

JF - Chemical Physics

IS - 2

ER -

Microwave transient nutation measurements of relaxation in OCS and NH₃

Abstract

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