High-resolution photoabsorption and photoionization spectra of HD and D₂

Technical Report · Sun Dec 31 23:00:00 EST 1978

DOI:https://doi.org/10.2172/8493533· OSTI ID:8493533

Dehmer, Patricia M. ^[1]; Dardi, P. S. ^[2]; Chupka, W. A. ^[3]

---

1. Argonne National Laboratory (ANL), Argonne, IL (United States)
2. Univ. of Illinois, Urbana, IL (United States)
3. Yale Univ., New Haven, CT (United States), Dept. of Chemistry

Relative photoabsorption and photoionization cross sections for D/sub 2/ and HD are reported in the wavelength region Relative photoabsorption and photoionization cross sections for D₂ and HD are reported in the wavelength region between approximately 805 Å and 735 Å. Many members of the npσ ¹Σ_u⁺ and npπ ¹Π_u Rydberg series for low n and low v were identified from previous assignments. An attempt was made to extend the assignments to higher vibrational quantum numbers for n=3-6, using previously reported spectroscopic constants. This attempt was only moderately successful because of the overlap of vibrational bands at higher v. The increasing complexity of the spectra at high v and at high n requires a more sophisticated analysis such as would be provided by multichannel quantum defect theory (MQDT). Ionization efficiencies were calculated for all identified states. The ionization efficiency was 1 for states which can autoionize by Δv = 1, i.e., the final state of the ion has a vibrational quantum number 1 less than the autoionizing state. In general, the ionization efficiency drops rapidly with Δv > 1. The 3pπ ¹Π_u state, which can autoionize only with a ..delta..v greater than or equal to 7, has essentially an ionization efficiency of zero, so decay must proceed by predissociation or molecular fluorescence.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 8493533
• Report Number(s): ANL--79-65(Pt.1)
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTROSCOPY
CROSS SECTIONS
DEUTERIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
ENERGY LEVELS
EXCITED STATES
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
HYDROGEN ISOTOPES
IONIZATION
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
PHOTOIONIZATION
RESOLUTION
SPECTROSCOPY
STABLE ISOTOPES
VIBRATIONAL STATES