TY - JOUR
T1 - High resolution photoabsorption spectrum of hexafluoro-1,3-butadiene (1,3-C 4F 6) as studied by vacuum ultraviolet (VUV) synchrotron radiation
AU - Silva, F. Ferreira da
AU - Almeida, D.
AU - Vasekova, E.
AU - Drage, E.
AU - Mason, N. J.
AU - Limão-Vieira, P.
N1 - FFS and DA acknowledge the Portuguese Foundation for Science and Technology (FCT-MES) through post-graduate and post- doctoral scholarships SFRH/BPD/68979/2010 and SFRH/BD/32271/2006, respectively. PLV acknowledges the PEst-OE/FIS/UI0068/2011 grant as well as the visiting professor position in the Molecular Physics group, Open University, UK. PLV and NJM acknowledge the support from the British Council for the Portuguese-English joint collaboration. ED recognizes support from NERC and EV The Open University for support of their PhD studentships. This Letter forms part of the EU COST Action CM0805 Programme 'The Chemical Cosmos', respectively.
PY - 2012/10/22
Y1 - 2012/10/22
N2 - In this Letter we present a high resolution VUV photoabsorption spectrum of hexafluoro-1,3-butadiene (1,3-C 4F 6), over the wavelength range 113-247 nm (11.0-5.0 eV). The spectrum reveals several new features not previously reported in the literature. The assignment of the observed valence and Rydberg transitions and the associated vibronic series is presented based on our recent ab initio calculations on the vertical excitation energies of C 4F 6 isomers. The dominant excitation has been assigned to the υ 1′(a) CC stretching mode in the (5 1A ← 1 1A, 3p a ← π a(20a)) and (7 1A ← 1 1A, 3p b ← π b(19b) ) transitions, with mean energies of 0.201 and 0.188 eV, respectively. The measured absolute photoabsorption cross section has been used to calculate the photolysis lifetime of 1,3-C 4F 6 in the upper stratosphere (20-50 km).
AB - In this Letter we present a high resolution VUV photoabsorption spectrum of hexafluoro-1,3-butadiene (1,3-C 4F 6), over the wavelength range 113-247 nm (11.0-5.0 eV). The spectrum reveals several new features not previously reported in the literature. The assignment of the observed valence and Rydberg transitions and the associated vibronic series is presented based on our recent ab initio calculations on the vertical excitation energies of C 4F 6 isomers. The dominant excitation has been assigned to the υ 1′(a) CC stretching mode in the (5 1A ← 1 1A, 3p a ← π a(20a)) and (7 1A ← 1 1A, 3p b ← π b(19b) ) transitions, with mean energies of 0.201 and 0.188 eV, respectively. The measured absolute photoabsorption cross section has been used to calculate the photolysis lifetime of 1,3-C 4F 6 in the upper stratosphere (20-50 km).
UR - http://www.scopus.com/inward/record.url?scp=84867332060&partnerID=8YFLogxK
U2 - 10.1016/j.cplett.2012.08.075
DO - 10.1016/j.cplett.2012.08.075
M3 - Article
AN - SCOPUS:84867332060
SN - 0009-2614
VL - 550
SP - 62
EP - 66
JO - Chemical Physics Letters
JF - Chemical Physics Letters
ER -