Photoionization of excited molecular states using multiphoton excitation techniques

Journal Article · Sat Sep 01 04:00:00 EDT 1984 · AIP Conf. Proc.; (United States)

DOI:https://doi.org/10.1063/1.34653· OSTI ID:6388998

Dehmer, P M; Pratt, S T; Dehmer, J L

Photoelectron spectra are reported for three photon resonant, four photon ionization of H/sub 2/ via the B /sup 1/..sigma../sup +//sub u/, v = 7 (J = 2,4) and C /sup 1/Pi/sub u/, v = 0-4 (J = 1) levels and of N/sub 2/ via the o/sub 3/ /sup 1/Pi/sub u/, v = 1,2, b /sup 1/Pi/sub u/, v = 3-5, and c /sup 1/Pi/sub u/, v = 0 levels. The results reflect both the spectroscopy and the dynamics of photoionization of excited molecular states and are discussed in terms of the selection rules for photoionization and the relative probabilities of photoionization from Rydberg and valence states. In some cases, in accordance with the Franck-Condon principle, the results demonstrate that resonant multiphoton ionization through Rydberg states may be a powerful technique for the production of electronic, vibrational, and rotational state selected ions. However, in other cases, systematic departures from Franck-Condon factors are observed, which reflect the more subtle dynamics of excited state photoionization.

• Research Organization: Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 6388998
• Journal Information: AIP Conf. Proc.; (United States), Journal Name: AIP Conf. Proc.; (United States) Vol. 119:1; ISSN APCPC
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FRANCK-CONDON PRINCIPLE
HYDROGEN
IONIZATION
MULTI-PHOTON PROCESSES
NITROGEN
NONMETALS
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
RYDBERG STATES
SELECTION RULES
SPECTROSCOPY