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Title: Rotational autoionization of np Rydberg series of D 2

Abstract

Two-color resonantly enhanced multiphoton ionization combined with photoelectron spectroscopy was used to study rotational autoionization of np Rydberg states of D 2 near the first ionization threshold. This work represents an extension of the study by O'Halloran et al. [J. Chem. Phys. 90, 930 (1989)] on the analogous states of H 2. As in that work, one laser was used to excite a two-photon transition to the E, F ¹Σ⁺ g, v´=0, E0, J´=0--4 levels, and a second laser was used to probe single-photon transitions to the rotationally autoionized np Rydberg states converging to the X ²Σ⁺ g, v⁺=0, N⁺ =1--6 rotational levels of D⁺ 2. Of the five dipole-allowed Rydberg series converging to v⁺=0 excited from each intermediate J´ level (J´≥2), two are allowed to rotationally autoionize in a coupling scheme that assumes ejection of pure p waves in the ionization process and singlet coupling of the spins of the ion core and the outgoing electron; members of these Rydberg series have large half-widths. As in H 2, autoionization requiring the change of four quanta of rotational energy was found to be significantly slower than that requiring the minimum change of two quanta. Ionization was also observed for themore » series that are forbidden to rotationally autoionize according to this simple coupling scheme, and it is shown that both the inclusion of f waves in the autoionization process and singlet--triplet mixing may be required to explain these observations. By extending the wavelength region of the J´=4 spectrum beyond that of the earlier study on H 2, rotational autoionization requiring even higher partial waves was observed.« less

Authors:
 [1];  [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE; Office of Health and Environmental Research (OHER)
OSTI Identifier:
7103609
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 92:1; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; DEUTERIUM; AUTOIONIZATION; MULTI-PHOTON PROCESSES; PHOTOELECTRON SPECTROSCOPY; ROTATIONAL STATES; RYDBERG STATES; ELECTRON SPECTROSCOPY; ENERGY LEVELS; EXCITED STATES; HYDROGEN ISOTOPES; IONIZATION; ISOTOPES; LIGHT NUCLEI; NUCLEI; ODD-ODD NUCLEI; SPECTROSCOPY; STABLE ISOTOPES; 640302* - Atomic, Molecular & Chemical Physics- Atomic & Molecular Properties & Theory

Citation Formats

Pratt, Stephen T., Dehmer, Patricia M., and Dehmer, Joseph L. Rotational autoionization of np Rydberg series of D2. United States: N. p., 1990. Web. doi:10.1063/1.458473.
Pratt, Stephen T., Dehmer, Patricia M., & Dehmer, Joseph L. Rotational autoionization of np Rydberg series of D2. United States. doi:10.1063/1.458473.
Pratt, Stephen T., Dehmer, Patricia M., and Dehmer, Joseph L. Mon . "Rotational autoionization of np Rydberg series of D2". United States. doi:10.1063/1.458473.
@article{osti_7103609,
title = {Rotational autoionization of np Rydberg series of D2},
author = {Pratt, Stephen T. and Dehmer, Patricia M. and Dehmer, Joseph L.},
abstractNote = {Two-color resonantly enhanced multiphoton ionization combined with photoelectron spectroscopy was used to study rotational autoionization of np Rydberg states of D2 near the first ionization threshold. This work represents an extension of the study by O'Halloran et al. [J. Chem. Phys. 90, 930 (1989)] on the analogous states of H2. As in that work, one laser was used to excite a two-photon transition to the E, F ¹Σ⁺g, v´=0, E0, J´=0--4 levels, and a second laser was used to probe single-photon transitions to the rotationally autoionized np Rydberg states converging to the X ²Σ⁺g, v⁺=0, N⁺ =1--6 rotational levels of D⁺2. Of the five dipole-allowed Rydberg series converging to v⁺=0 excited from each intermediate J´ level (J´≥2), two are allowed to rotationally autoionize in a coupling scheme that assumes ejection of pure p waves in the ionization process and singlet coupling of the spins of the ion core and the outgoing electron; members of these Rydberg series have large half-widths. As in H2, autoionization requiring the change of four quanta of rotational energy was found to be significantly slower than that requiring the minimum change of two quanta. Ionization was also observed for the series that are forbidden to rotationally autoionize according to this simple coupling scheme, and it is shown that both the inclusion of f waves in the autoionization process and singlet--triplet mixing may be required to explain these observations. By extending the wavelength region of the J´=4 spectrum beyond that of the earlier study on H2, rotational autoionization requiring even higher partial waves was observed.},
doi = {10.1063/1.458473},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = ,
volume = 92:1,
place = {United States},
year = {1990},
month = {1}
}