Photoionization dynamics of excited molecular states. Photoelectron angular distributions and rotational and vibrational branching ratios for H₂ C ¹Π_u, v=0–4

Journal Article · Wed Jan 01 04:00:00 EST 1986 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.450959· OSTI ID:5086257

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

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

Photoelectron angular distributions following three photonresonant, four photon (3+1) ionization of H₂ via the C ¹Π_u, v'=0-4←X ¹Σ_g⁺, v''= 0 Q(1) transitions are reported. The observed angular distributions are generally more isotropic for v⁺≠v' than for v⁺=v'. Photoelectron spectra obtained along the polarization axis of the laser following (3+1)= ionization via the C ¹Π_u, v'= 4←X ¹Σ_g⁺, v"= 0 R(0) and R(1) transitions are also reported. These spectra are rotationally resolved and exhibit strongly v⁺-dependent rotational branching ratios. The comparison of the angular distribution data with available theoretical calculations indicates good agreement for some transitions and poor agreement for others, suggesting the need for substantial progress in understanding the photoionizationdynamics of even the simplest excited molecular states.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE; Office of Health and Environmental Research (OHER); Office of Naval Research (ONR)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5086257
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 6 Vol. 85; ISSN JCPSA6; ISSN 0021-9606
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
BRANCHING RATIO
DISTRIBUTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LEVELS
EXCITED STATES
HYDROGEN
IONIZATION
NONMETALS
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
ROTATIONAL STATES
SPECTROSCOPY
VIBRATIONAL STATES