Photoabsorption and photoionization of HD

Journal Article · Fri Dec 31 23:00:00 EST 1982 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.446029· OSTI ID:5914025

Dehmer, Patricia M. ^[1]; Chupka, William A. ^[2]

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1. Argonne National Lab. (ANL), Argonne, IL (United States)
2. Yale Univ., New Haven, CT (United States)

Relative photoabsorption and photoionization cross sections have been measured for HD at a temperature of 78 K in the wavelength region from 735 to 805 Â. The present wavelength resolution of 0.016 Â represents an improvement of more than two orders of magnitude over that of previous photoionization studies of this molecule. Bands of the 3pπ D ¹Π_u←X ¹Σ_g⁺ system are observed to v'=17, and ionization efficiencies are reported for a number of Rydberg states of low principal quantum number. As in the case of H₂, the ionization efficiency is close to unity for Rydberg states that can autoionize with Δv= -1, but drops to zero for states that can autoionize only with a large change in vibrational quantum number and that are significantly predissociated (such as the 3pπ D ¹Π_u state). The breakdown of (g,u) symmetry in HD and the resulting effects on the absorption spectrum and on the decay paths of the Rydberg states are discussed.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE; Office of Naval Research (ONR)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5914025
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 4 Vol. 79; 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
ABSORPTION SPECTRA
CORRECTIONS
CROSS SECTIONS
DEUTERIDES
DEUTERIUM COMPOUNDS
ELECTROMAGNETIC RADIATION
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
IONIZATION
LOW TEMPERATURE
PHOTOIONIZATION
RADIATIONS
RYDBERG CORRECTION
SPECTRA
ULTRAVIOLET RADIATION