skip to main content

SciTech ConnectSciTech Connect

Title: High-resolution photoabsorption spectrum of jet-cooled propyne

The absolute photoabsorption cross section of propyne was recorded between 62 000 and 88 000 cm{sup −1} by using the vacuum-ultraviolet, Fourier-transform spectrometer at the Synchrotron Soleil. This cross section spans the region including the lowest Rydberg bands and extends above the Franck-Condon envelope for ionization to the ground electronic state of the propyne cation, X{sup ~+}. Room-temperature spectra were recorded in a flowing cell at 0.9 cm{sup −1} resolution, and jet-cooled spectra were recorded at 1.8 cm{sup −1} resolution and a rotational temperature of ∼100 K. The reduced widths of the rotational band envelopes in the latter spectra reveal new structure and simplify a number of assignments. Although nf Rydberg series have not been assigned previously in the photoabsorption spectrum of propyne, arguments are presented for their potential importance, and the assignment of one nf series is proposed. As expected from previous photoelectron spectra, Rydberg series are also observed above the adiabatic ionization threshold that converge to the v{sub 3}{sup +} = 1 and 2 levels of the C≡C stretching vibration.
Authors:
 [1] ;  [2] ;  [3] ; ; ; ;  [4] ;  [5] ; ;  [6]
  1. Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich (Switzerland)
  2. STFC, Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD (United Kingdom)
  3. Institut des Sciences Moléculaires d’Orsay, UMR 8214, CNRS and Univ. Paris-Sud, F-91405 Orsay (France)
  4. Synchrotron Soleil, L’Orme des Merisiers, F-91192 Gif-sur-Yvette (France)
  5. Department of Chemistry, Texas A and M University, College Station, Texas 77843 (United States)
  6. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
22308405
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 141; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CATIONS; CROSS SECTIONS; FOURIER TRANSFORM SPECTROMETERS; IONIZATION; PHOTOELECTRON SPECTROSCOPY; PROPYNE; ROTATIONAL STATES; RYDBERG STATES; SPECTRA