Off-resonant vibrational excitation: Orientational dependence and spatial control of photofragments

Mette Machholm, Niels Engholm Henriksen

Research output: Contribution to journalJournal articleResearchpeer-review

361 Downloads (Pure)

Abstract

Off-resonant and resonant vibrational excitation with short intense infrared (IR) laser pulses creates localized oscillating wave packets, but differs by the efficiency of the excitation and surprisingly by the orientational dependence. Orientational selectivity of the vibrational excitation of randomly oriented heteronuclear diatomic molecules can be obtained under simultaneous irradiation by a resonant and an off-resonant intense IR laser pulse: Molecules with one initial orientation will be vibrationally excited, while those with the opposite orientation will be at rest. The orientation-dependent response to the IR fields is due to the anharmonicity of the potential. A subsequent ultraviolet laser pulse in resonance at the outer turning point of the vibrational motion can then dissociate the oscillating molecules, all with the same orientation, leading to spatial control of the photofragment distribution. (C) 2000 American Institute of Physics.
Original languageEnglish
JournalJournal of Chemical Physics
Volume113
Issue number18
Pages (from-to)7838-7844
ISSN0021-9606
DOIs
Publication statusPublished - 2000

Bibliographical note

Copyright (2000) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Keywords

  • FIELDS
  • PHOTODISSOCIATION
  • MOLECULES
  • 2-PULSE LASER CONTROL

Cite this

@article{d288b9c2c1984a47848b3878f9cd4210,
title = "Off-resonant vibrational excitation: Orientational dependence and spatial control of photofragments",
abstract = "Off-resonant and resonant vibrational excitation with short intense infrared (IR) laser pulses creates localized oscillating wave packets, but differs by the efficiency of the excitation and surprisingly by the orientational dependence. Orientational selectivity of the vibrational excitation of randomly oriented heteronuclear diatomic molecules can be obtained under simultaneous irradiation by a resonant and an off-resonant intense IR laser pulse: Molecules with one initial orientation will be vibrationally excited, while those with the opposite orientation will be at rest. The orientation-dependent response to the IR fields is due to the anharmonicity of the potential. A subsequent ultraviolet laser pulse in resonance at the outer turning point of the vibrational motion can then dissociate the oscillating molecules, all with the same orientation, leading to spatial control of the photofragment distribution. (C) 2000 American Institute of Physics.",
keywords = "FIELDS, PHOTODISSOCIATION, MOLECULES, 2-PULSE LASER CONTROL",
author = "Mette Machholm and Henriksen, {Niels Engholm}",
note = "Copyright (2000) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.",
year = "2000",
doi = "10.1063/1.1316003",
language = "English",
volume = "113",
pages = "7838--7844",
journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics",
number = "18",

}

Off-resonant vibrational excitation: Orientational dependence and spatial control of photofragments. / Machholm, Mette; Henriksen, Niels Engholm.

In: Journal of Chemical Physics, Vol. 113, No. 18, 2000, p. 7838-7844.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Off-resonant vibrational excitation: Orientational dependence and spatial control of photofragments

AU - Machholm, Mette

AU - Henriksen, Niels Engholm

N1 - Copyright (2000) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

PY - 2000

Y1 - 2000

N2 - Off-resonant and resonant vibrational excitation with short intense infrared (IR) laser pulses creates localized oscillating wave packets, but differs by the efficiency of the excitation and surprisingly by the orientational dependence. Orientational selectivity of the vibrational excitation of randomly oriented heteronuclear diatomic molecules can be obtained under simultaneous irradiation by a resonant and an off-resonant intense IR laser pulse: Molecules with one initial orientation will be vibrationally excited, while those with the opposite orientation will be at rest. The orientation-dependent response to the IR fields is due to the anharmonicity of the potential. A subsequent ultraviolet laser pulse in resonance at the outer turning point of the vibrational motion can then dissociate the oscillating molecules, all with the same orientation, leading to spatial control of the photofragment distribution. (C) 2000 American Institute of Physics.

AB - Off-resonant and resonant vibrational excitation with short intense infrared (IR) laser pulses creates localized oscillating wave packets, but differs by the efficiency of the excitation and surprisingly by the orientational dependence. Orientational selectivity of the vibrational excitation of randomly oriented heteronuclear diatomic molecules can be obtained under simultaneous irradiation by a resonant and an off-resonant intense IR laser pulse: Molecules with one initial orientation will be vibrationally excited, while those with the opposite orientation will be at rest. The orientation-dependent response to the IR fields is due to the anharmonicity of the potential. A subsequent ultraviolet laser pulse in resonance at the outer turning point of the vibrational motion can then dissociate the oscillating molecules, all with the same orientation, leading to spatial control of the photofragment distribution. (C) 2000 American Institute of Physics.

KW - FIELDS

KW - PHOTODISSOCIATION

KW - MOLECULES

KW - 2-PULSE LASER CONTROL

U2 - 10.1063/1.1316003

DO - 10.1063/1.1316003

M3 - Journal article

VL - 113

SP - 7838

EP - 7844

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 18

ER -