Photoelectron spectroscopy from the tilde à ¹A_u state of acetylene: The bending vibrations of C₂H⁺₂ X ²Π_u

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.461570· OSTI ID:5221030

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 spectra are reported for one-photon resonant, two-photon ionization of acetylene via a number of vibronic levels of the à ¹A_u state. Because the à ¹A_u state is t r a n s bent and the X ²Π_u ground state of the ion is linear, ionization from the à ¹A_u levels produces a long progression in the t r a n s-bending vibration of the ion. The X ²Π_u state is split by the Renner--Teller interaction along the t r a n s-bending coordinate; the analysis of the photoelectron spectra allows the determination of the Renner--Teller parameters and leads to reassignments of the c i s and t r a n s-bending vibrations in earlier photoelectron studies.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE; Office of Energy Research (OER); Office of Health and Environmental Research (OHER)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5221030
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Vol. 95:9; ISSN JCPSA; 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
ACETYLENE
ALKYNES
COUPLING
ELECTRON SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
GROUND STATES
HYDROCARBONS
IONIZATION
MULTI-PHOTON PROCESSES
ORGANIC COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
RESONANCE
SPECTROSCOPY
VIBRATIONAL STATES