Journal ArticleDOI
Rotational state distributions in the photolysis of water: Influence of the potential anisotropy
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TLDR
In this paper, a detailed investigation of rotationally inelastic effects in photodissociation of water in the first absorption band using a recently calculated ab initio potential energy surface of the A 1B1 state was performed.Abstract:
We report a detailed investigation of rotationally inelastic effects in the photodissociation of water in the first absorption band using a recently calculated ab initio potential energy surface of the A 1B1 state. Although the excited state potential anisotropy is large it has only very weak influence on the rotational state distributions which thus simply reflect the angular behavior of the ground state wave function of the parent molecule. The reason is that both potential energy surfaces have roughly the same equilibrium angle. Strong inelastic effects are observed, however, for dissociation out of excited bent states because the corresponding ground state wave function extends over a considerably wider angular range and thus the more anisotropic regions of the excited state potential are probed. Calculations are performed on three levels of accuracy for the continuum wave function: close‐coupling, coupled‐states (CS), and infinite‐order‐sudden (IOS) approximation. The ground state wave function is treated numerically exactly. The CS approximation is found to be extremely reliable for those cases studied in this work. The accuracy of the IOS approximation depends very much on the region of orientation angle probed by the ground state and therefore a general conclusion is not possible. Finally, OH rotational state distributions obtained from the dissociation of water and from H–OH scattering at equivalent translational energies are compared and found to be extremely different.read more
Citations
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Journal ArticleDOI
Photodissociation dynamics of H2O and D2O in the first absorption band: A complete abinitio treatment
TL;DR: In this paper, a detailed theortical study of the photodissociation of H2O and D2O in the first absorption band (λ∼165 nm) is presented.
Journal ArticleDOI
State to state photodissociation of H2O in the first absorption band
TL;DR: In this paper, a tunable IR laser is used to prepare single rotational states in the asymmetric stretch mode, and subsequent photodissociation at 193 nm favors product formation from these single prepared states.
Journal ArticleDOI
Chemical "Double Slits": Dynamical Interference of Photodissociation Pathways in Water
TL;DR: The interference observed from the two conical intersection pathways provides a chemical analog of Young's well-known double-slit experiment.
Journal ArticleDOI
An experimental and theoretical study of the bond selected photodissociation of HOD
TL;DR: In this paper, the authors provide a qualitative and quantitative understanding of the photodissociation dynamics and bond selectivity of this process, and show that the origin of the selectivity and its energy dependence is the communication of the initial vibrational state with different portions of the outgoing continuum wave function for different photolysis energies.
Journal ArticleDOI
Isotope effects in the fragmentation of water: The photodissociation of HOD in the first absorption band
V. Engel,R. Schinke +1 more
TL;DR: In this article, the photofragmentation of HOD in the first absorption band was investigated and the final vibrational distributions for OD and OD are relatively broad indicating strong final state interaction.
References
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Space‐fixed vs body‐fixed axes in atom‐diatomic molecule scattering. Sudden approximations
TL;DR: The Arthurs and Dalgarno space-fixed (SF) axes formulation of the quantum theory of atom-diatom scattering is compared with the bodyfixed (BF) axis formulation of Curtiss using consistent notation to facilitate the comparison as discussed by the authors.
Journal ArticleDOI
Quantum mechanical close coupling approach to molecular collisions. jz ‐conserving coupled states approximation
Paul McGuire,Donald J. Kouri +1 more
TL;DR: In this article, the authors derived new coupled equations describing collisions of an atom and a diatomic molecule by neglecting the effect on the wavefunction of the rotation of the coordinate axes.
Journal ArticleDOI
Absorption Coefficients of Water Vapor in the Vacuum Ultraviolet
K. Watanabe,Murray Zelikoff +1 more
TL;DR: In this paper, the absorption coefficients of water vapor in the region 1060-1860A were obtained by a photoelectric method described previously, and the results showed that the absorption coefficient was between the values reported by two groups of investigators.
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