Threshold photoelectron spectra of atmospheric molecules. I. Description of method and application to H/sub 2/, D/sub 2/, and N/sub 2/
Threshold photoelectron spectra (TPES) are presented for H/sub 2/, D/sub 2/, and N/sub 2/ with a resolution of 28 meV full width at half maximum. The results are compared with Franck--Condon transition probabilities, previous TPES and electron attachment threshold photoelectron spectra. Peaks in the TPES not predicted by Franck--Condon calculations are explained by autoionization processes. These processes in N/sub 2/ make possible the observation of vibrational levels of the ions not visible spectroscopically or in photoelectron spectra. A shift of the TPES peaks in N/sub 2/ toward lower energy is explained by conversion of rotational energy in the ionization transition. Peaks between the v=O and v=1 vibrational levels of the X /sup 2/..sigma../sub g//sup +/ state of N/sub 2//sup +/ consist of near monoenergetic electrons implying little or no change in the rotational quantum number in the autoionization process.
- Research Organization:
- National Measurement Laboratory, National Bureau of Standards, Washington, DC 20234
- OSTI ID:
- 6462523
- Journal Information:
- J. Chem. Phys.; (United States), Vol. 70:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DEUTERIUM
PHOTOELECTRON SPECTROSCOPY
HYDROGEN
NITROGEN
EXPERIMENTAL DATA
GRAPHS
PHOTOIONIZATION
RESOLUTION
SPECTRAL SHIFT
CRYOGENIC FLUIDS
DATA
DATA FORMS
ELECTRON SPECTROSCOPY
ELEMENTS
FLUIDS
HYDROGEN ISOTOPES
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IONIZATION
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SPECTROSCOPY
STABLE ISOTOPES
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory