Zero-kinetic-energy photoelectron spectroscopy from the ù A_u state of acetylene: Renner–Teller interactions in the trans-bending vibration of C₂H⁺₂ X^~²Π_u

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.465888· OSTI ID:5922667

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)

Double-resonance excitation via the ù A_u state is used to record zero-kinetic-energy photoelectron spectra of acetylene. The analysis of these spectra leads to an improved value of 91 952±2cm⁻¹ for the adiabatic ionization potential to the C₂H⁺₂ X^~²Π_u ionic ground state. Because the ù A_u intermediate state has a trans-bent geometry, transitions from it readily populate the trans-bending vibration of the ground state ion, leading to new information about this mode and its Renner--Teller interactions. The relative intensities of the Renner--Teller components and of the rotational structure within each component also provide information on the dynamics of the photoionization process.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• Sponsoring Organization: USDOE; Office of Health and Environmental Research (OHER)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5922667
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 9 Vol. 99; ISSN JCPSA6; ISSN 0021-9606
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
664400 -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ACETYLENE
ADIABATIC APPROXIMATION
ALKYNES
CHARGED PARTICLES
COUPLING
DOUBLE RESONANCE METHODS
ELECTRON SPECTROSCOPY
ENERGY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
GROUND STATES
HYDROCARBONS
IONIZATION
IONIZATION POTENTIAL
IONS
KINETIC ENERGY
MOLECULAR IONS
ORGANIC COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
ROTATIONAL STATES
SPECTROSCOPY
VIBRATIONAL STATES