Photoionization of excited molecular states using multiphoton excitation techniques

Conference · Sat Dec 31 23:00:00 EST 1983

OSTI ID:5211610

Dehmer, Patricia M. ^[1]; Pratt, Stephen T. ^[1]; Dehmer, Joseph L. ^[1]

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1. Argonne National Laboratory (ANL), Argonne, IL (United States)

Photoelectron spectra are reported for three photon resonant, four photon ionization of H₂ via the B ¹Σ_u⁺, v = 7 (J = 2,4) and C ¹Π_u v = 0-4 (J = 1) levels and of N₂ via the o₃ ¹Π_u, v = 1,2, b ¹Π_u, v = 3-5, and c ¹Π_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 Lab., IL (USA)
• Sponsoring Organization: USDOE; Office of Naval Research
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5211610
• Report Number(s): CONF-840387--3; ON: DE84009150
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LEVELS
EXCITED STATES
HYDROGEN
IONIZATION
NITROGEN
NONMETALS
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
RYDBERG STATES
SPECTROSCOPY
VIBRATIONAL STATES