Photoelectron spectroscopy via the 1 {sup 1}{triangle}{sub u} state of diacetylene.

Journal Article · Fri Mar 08 04:00:00 EST 2002 · J. Chem. Phys.

DOI:https://doi.org/10.1063/1.1448488· OSTI ID:949404

Ramos, C; Winter, P; Zwier, T; Pratt, S

Photoelectron spectra are reported for one-photon resonant, two-photon ionization of jet-cooled diacetylene via a number of vibronic levels of the 1 {sup 1}{Delta}{sub (u)} state. An improved value for the adiabatic ionization threshold is found to be 82 064{+-}30 cm-1 (10.175{+-}0.004 eV), in good agreement with the earlier result. The photoelectron spectra of different vibronic bands of the 1 {sup 1}{Delta}{sub (u)} state nearly all show long progressions in what appear to be low frequency bending vibrations. At energies just above the ionization threshold, the observed progressions can be understood in terms of excitation of a single Renner-Teller active mode in the ion, with Renner-Teller parameters similar to those of the {nu}{sub 4}{sup +} trans-bending mode in the ground state acetylene cation.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 949404
• Report Number(s): ANL/CHM/JA-40645
• Journal Information: J. Chem. Phys., Journal Name: J. Chem. Phys. Journal Issue: 10 ; Mar. 8, 2002 Vol. 116; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ACETYLENE
BENDING
EXCITATION
GROUND STATES
IONIZATION
PHOTOELECTRON SPECTROSCOPY
SPECTRA