Differential scattering cross-sections for CN A2Π+Ar

Azhagammai Alagappan, Iain Ballingall, Matthew L. Costen, Kenneth G. McKendrick

Research output: Contribution to journalArticle

Abstract

We present the first results from a novel experimental approach to the measurement of state-to-state differential scattering cross-sections for inelastic scattering of electronically excited CN A2 ? with Ar. Photodissociation of ICN with linearly polarized 266 nm radiation generates CN X2 + (? =0, J?) with a near mono-energetic speed distribution and large anisotropy. Saturated optical pumping of the nascent CN X2 + transfers this speed distribution without distortion to selected rotational quantum states of the A2 ? (' =4) level. The products of rotational energy transfer within the A2 ? (' =4) level into the J' =0.5, F2, f, state are probed using frequency modulated stimulated emission spectroscopy on the A-X (4,2) band with a single frequency external cavity tunable diode laser. Doppler profiles of transitions from individual rotational, spin-orbit and lambda doublet specific levels are acquired for different geometrical arrangements of photolysis polarization and probe propagation directions. The resulting Doppler profiles, which for this J' =0.5 state cannot display a rotational angular momentum alignment, are combined to yield composite Doppler profiles depending on speed and translational anisotropy, which are analyzed to determine fully state-to-state resolved differential scattering cross-sections. © 2007 American Institute of Physics.

Original languageEnglish
Article number041103
JournalJournal of Chemical Physics
Volume126
Issue number4
DOIs
Publication statusPublished - 2007

Fingerprint

varespladib methyl
Anisotropy
Semiconductor Lasers
Photolysis
Energy Transfer
Physics
Orbit
Spectrum Analysis
Radiation

Cite this

@article{454c7617e08e466dbc1c957580752dd8,
title = "Differential scattering cross-sections for CN A2Π+Ar",
abstract = "We present the first results from a novel experimental approach to the measurement of state-to-state differential scattering cross-sections for inelastic scattering of electronically excited CN A2 ? with Ar. Photodissociation of ICN with linearly polarized 266 nm radiation generates CN X2 + (? =0, J?) with a near mono-energetic speed distribution and large anisotropy. Saturated optical pumping of the nascent CN X2 + transfers this speed distribution without distortion to selected rotational quantum states of the A2 ? (' =4) level. The products of rotational energy transfer within the A2 ? (' =4) level into the J' =0.5, F2, f, state are probed using frequency modulated stimulated emission spectroscopy on the A-X (4,2) band with a single frequency external cavity tunable diode laser. Doppler profiles of transitions from individual rotational, spin-orbit and lambda doublet specific levels are acquired for different geometrical arrangements of photolysis polarization and probe propagation directions. The resulting Doppler profiles, which for this J' =0.5 state cannot display a rotational angular momentum alignment, are combined to yield composite Doppler profiles depending on speed and translational anisotropy, which are analyzed to determine fully state-to-state resolved differential scattering cross-sections. {\circledC} 2007 American Institute of Physics.",
author = "Azhagammai Alagappan and Iain Ballingall and Costen, {Matthew L.} and McKendrick, {Kenneth G.}",
year = "2007",
doi = "10.1063/1.2437164",
language = "English",
volume = "126",
journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics Publising LLC",
number = "4",

}

Differential scattering cross-sections for CN A2Π+Ar. / Alagappan, Azhagammai; Ballingall, Iain; Costen, Matthew L.; McKendrick, Kenneth G.

In: Journal of Chemical Physics, Vol. 126, No. 4, 041103, 2007.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Differential scattering cross-sections for CN A2Π+Ar

AU - Alagappan, Azhagammai

AU - Ballingall, Iain

AU - Costen, Matthew L.

AU - McKendrick, Kenneth G.

PY - 2007

Y1 - 2007

N2 - We present the first results from a novel experimental approach to the measurement of state-to-state differential scattering cross-sections for inelastic scattering of electronically excited CN A2 ? with Ar. Photodissociation of ICN with linearly polarized 266 nm radiation generates CN X2 + (? =0, J?) with a near mono-energetic speed distribution and large anisotropy. Saturated optical pumping of the nascent CN X2 + transfers this speed distribution without distortion to selected rotational quantum states of the A2 ? (' =4) level. The products of rotational energy transfer within the A2 ? (' =4) level into the J' =0.5, F2, f, state are probed using frequency modulated stimulated emission spectroscopy on the A-X (4,2) band with a single frequency external cavity tunable diode laser. Doppler profiles of transitions from individual rotational, spin-orbit and lambda doublet specific levels are acquired for different geometrical arrangements of photolysis polarization and probe propagation directions. The resulting Doppler profiles, which for this J' =0.5 state cannot display a rotational angular momentum alignment, are combined to yield composite Doppler profiles depending on speed and translational anisotropy, which are analyzed to determine fully state-to-state resolved differential scattering cross-sections. © 2007 American Institute of Physics.

AB - We present the first results from a novel experimental approach to the measurement of state-to-state differential scattering cross-sections for inelastic scattering of electronically excited CN A2 ? with Ar. Photodissociation of ICN with linearly polarized 266 nm radiation generates CN X2 + (? =0, J?) with a near mono-energetic speed distribution and large anisotropy. Saturated optical pumping of the nascent CN X2 + transfers this speed distribution without distortion to selected rotational quantum states of the A2 ? (' =4) level. The products of rotational energy transfer within the A2 ? (' =4) level into the J' =0.5, F2, f, state are probed using frequency modulated stimulated emission spectroscopy on the A-X (4,2) band with a single frequency external cavity tunable diode laser. Doppler profiles of transitions from individual rotational, spin-orbit and lambda doublet specific levels are acquired for different geometrical arrangements of photolysis polarization and probe propagation directions. The resulting Doppler profiles, which for this J' =0.5 state cannot display a rotational angular momentum alignment, are combined to yield composite Doppler profiles depending on speed and translational anisotropy, which are analyzed to determine fully state-to-state resolved differential scattering cross-sections. © 2007 American Institute of Physics.

UR - http://www.scopus.com/inward/record.url?scp=33847697770&partnerID=8YFLogxK

U2 - 10.1063/1.2437164

DO - 10.1063/1.2437164

M3 - Article

C2 - 17286454

VL - 126

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 4

M1 - 041103

ER -