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Title: Femtosecond stimulated emission pumping: Characterization of the I{sub 2}{sup -} ground state

Abstract

Femtosecond stimulated emission pumping in combination with femtosecond photoelectron spectroscopy is used to characterize the potential energy function of the I{sub 2}{sup -}(X(tilde sign) {sup 2}{sigma}{sub u}{sup +}) ground state up to vibrational energies within 2% of the dissociation limit. The frequency and anharmonicity of this state are measured at a series of vibrational energies up to 0.993 eV by coherently populating a superposition of ground state vibrational levels using femtosecond stimulated emission pumping, and monitoring the resulting wave packet oscillations with femtosecond photoelectron spectroscopy. The dissociative I{sub 2}{sup -}(A(tilde sign){sup '} {sup 2}{pi}{sub g,1/2}) state is used for intermediate population transfer, allowing efficient population transfer to all ground state levels. Using the measured frequencies and anharmonicities, the X(tilde sign) {sup 2}{sigma}{sub u}{sup +} state has been fit to a modified Morse potential with the {beta}-parameter expanded in a Taylor series, and the bond length, well depth, and {upsilon}=0-1 fundamental frequency set equal to our previously determined Morse potential [J. Chem. Phys. 107, 7613 (1997)]. At high vibrational energies, the modified potential deviates significantly from the previously determined potential. (c) 2000 American Institute of Physics.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1]
  1. Department of Chemistry, University of California, Berkeley, California 94720 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20216378
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 112; Journal Issue: 20; Other Information: PBD: 22 May 2000; Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; IODINE IONS; ANIONS; ELECTRONIC STRUCTURE; GROUND STATES; STIMULATED EMISSION; PUMPING; PHOTOELECTRON SPECTROSCOPY; EXPERIMENTAL DATA

Citation Formats

Zanni, Martin T., Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Davis, Alison V., Frischkorn, Christian, Elhanine, Mohammed, and Neumark, Daniel M. Femtosecond stimulated emission pumping: Characterization of the I{sub 2}{sup -} ground state. United States: N. p., 2000. Web. doi:10.1063/1.481499.
Zanni, Martin T., Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Davis, Alison V., Frischkorn, Christian, Elhanine, Mohammed, & Neumark, Daniel M. Femtosecond stimulated emission pumping: Characterization of the I{sub 2}{sup -} ground state. United States. doi:10.1063/1.481499.
Zanni, Martin T., Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Davis, Alison V., Frischkorn, Christian, Elhanine, Mohammed, and Neumark, Daniel M. Mon . "Femtosecond stimulated emission pumping: Characterization of the I{sub 2}{sup -} ground state". United States. doi:10.1063/1.481499.
@article{osti_20216378,
title = {Femtosecond stimulated emission pumping: Characterization of the I{sub 2}{sup -} ground state},
author = {Zanni, Martin T. and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 and Davis, Alison V. and Frischkorn, Christian and Elhanine, Mohammed and Neumark, Daniel M.},
abstractNote = {Femtosecond stimulated emission pumping in combination with femtosecond photoelectron spectroscopy is used to characterize the potential energy function of the I{sub 2}{sup -}(X(tilde sign) {sup 2}{sigma}{sub u}{sup +}) ground state up to vibrational energies within 2% of the dissociation limit. The frequency and anharmonicity of this state are measured at a series of vibrational energies up to 0.993 eV by coherently populating a superposition of ground state vibrational levels using femtosecond stimulated emission pumping, and monitoring the resulting wave packet oscillations with femtosecond photoelectron spectroscopy. The dissociative I{sub 2}{sup -}(A(tilde sign){sup '} {sup 2}{pi}{sub g,1/2}) state is used for intermediate population transfer, allowing efficient population transfer to all ground state levels. Using the measured frequencies and anharmonicities, the X(tilde sign) {sup 2}{sigma}{sub u}{sup +} state has been fit to a modified Morse potential with the {beta}-parameter expanded in a Taylor series, and the bond length, well depth, and {upsilon}=0-1 fundamental frequency set equal to our previously determined Morse potential [J. Chem. Phys. 107, 7613 (1997)]. At high vibrational energies, the modified potential deviates significantly from the previously determined potential. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.481499},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 20,
volume = 112,
place = {United States},
year = {2000},
month = {5}
}