Hydrogen-atom photofragment spectroscopy. Photodissociation dynamics of H2O in the B–X absorption band

HJ KRAUTWALD; L SCHNIEDER; KH WELGE; Michael N R Ashfold

doi:10.1039/DC9868200099

Hydrogen-atom photofragment spectroscopy. Photodissociation dynamics of H₂O in the B–X absorption band

HJ KRAUTWALD^*, L SCHNIEDER, KH WELGE, Michael N R Ashfold

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

Abstract

The photofragmentation dynamics of H₂O molecules following vacuum ultraviolet laser excitation at wavelengths within the B¹A₁–X¹A₁ absorption band have been investigated using a novel from of photofragment translational spectroscopy. Analysis of the nascent H atom time-of-flight spectra confirms the importance of the dissociation channel leading to ground-state H + OH products. In addition, it reveals that the OH(X) fragments are formed predominantly in their zero-point vibrational level with a highly excited, inverted rotational-state population distribution. A consideration of the topology of the various potential-energy surfaces sampled by the H₂O molecules during this electronically non-adiabatic dissociation process suggests a likely explanation for this observed pattern of energy disposal.

Original language	English
Pages (from-to)	99-110
Number of pages	12
Journal	Faraday Discussions of the Chemical Society
Volume	82
DOIs	https://doi.org/10.1039/DC9868200099
Publication status	Published - 1986

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@article{5a256109322e4ffcb6207fe5abaa4c69,

title = "Hydrogen-atom photofragment spectroscopy. Photodissociation dynamics of H2O in the B–X absorption band",

abstract = "The photofragmentation dynamics of H2O molecules following vacuum ultraviolet laser excitation at wavelengths within the B1A1–X1A1 absorption band have been investigated using a novel from of photofragment translational spectroscopy. Analysis of the nascent H atom time-of-flight spectra confirms the importance of the dissociation channel leading to ground-state H + OH products. In addition, it reveals that the OH(X) fragments are formed predominantly in their zero-point vibrational level with a highly excited, inverted rotational-state population distribution. A consideration of the topology of the various potential-energy surfaces sampled by the H2O molecules during this electronically non-adiabatic dissociation process suggests a likely explanation for this observed pattern of energy disposal.",

author = "HJ KRAUTWALD and L SCHNIEDER and KH WELGE and Ashfold, {Michael N R}",

year = "1986",

doi = "10.1039/DC9868200099",

language = "English",

volume = "82",

pages = "99--110",

journal = "Faraday Discussions of the Chemical Society",

issn = "0301-7249",

publisher = "Royal Society of Chemistry",

}

TY - JOUR

T1 - Hydrogen-atom photofragment spectroscopy. Photodissociation dynamics of H2O in the B–X absorption band

AU - KRAUTWALD, HJ

AU - SCHNIEDER, L

AU - WELGE, KH

AU - Ashfold, Michael N R

PY - 1986

Y1 - 1986

N2 - The photofragmentation dynamics of H2O molecules following vacuum ultraviolet laser excitation at wavelengths within the B1A1–X1A1 absorption band have been investigated using a novel from of photofragment translational spectroscopy. Analysis of the nascent H atom time-of-flight spectra confirms the importance of the dissociation channel leading to ground-state H + OH products. In addition, it reveals that the OH(X) fragments are formed predominantly in their zero-point vibrational level with a highly excited, inverted rotational-state population distribution. A consideration of the topology of the various potential-energy surfaces sampled by the H2O molecules during this electronically non-adiabatic dissociation process suggests a likely explanation for this observed pattern of energy disposal.

AB - The photofragmentation dynamics of H2O molecules following vacuum ultraviolet laser excitation at wavelengths within the B1A1–X1A1 absorption band have been investigated using a novel from of photofragment translational spectroscopy. Analysis of the nascent H atom time-of-flight spectra confirms the importance of the dissociation channel leading to ground-state H + OH products. In addition, it reveals that the OH(X) fragments are formed predominantly in their zero-point vibrational level with a highly excited, inverted rotational-state population distribution. A consideration of the topology of the various potential-energy surfaces sampled by the H2O molecules during this electronically non-adiabatic dissociation process suggests a likely explanation for this observed pattern of energy disposal.

U2 - 10.1039/DC9868200099

DO - 10.1039/DC9868200099

M3 - Article (Academic Journal)

VL - 82

SP - 99

EP - 110

JO - Faraday Discussions of the Chemical Society

JF - Faraday Discussions of the Chemical Society

SN - 0301-7249