The VUV electronic spectroscopy of acetone studied by synchrotron radiation

Abstract

The electronic state spectroscopy of acetone (CH3)2CO has been investigated using high-resolution VUV photoabsorption spectroscopy in the energy range 3.7-10.8 eV. New vibronic structure has been observed, notably in the low energy absorption band assigned to the 1(1)A(1) --> 1(1)A2 (ny --> pi*) transition. The local absorption maximum at 7.85 eV has been tentatively attributed to the 4(1)A1 (pi --> pi*) transition. Six Rydberg series converging to the lowest ionisation energy (9.708 eV) have been assigned as well as a newly-resolved ns Rydberg series converging to the first ionic excited state (12.590 eV). Rydberg orbitals of each series have been classified according to the magnitude of the quantum defect (delta) and are extended to higher quantum numbers than in the previous analyses.

Electronic excitation of carbonyl sulphide (COS) by high-resolution vacuum ultraviolet photoabsorption and electron-impact spectroscopy in the energy region from 4 to 11 eV

“…Previously, we have observed a similar effect on acetone lowest-lying excited state dipole forbidden band, identified as 3b 1 (π * ) ← 5b 2 (n y ) (1 1 A 2 ← 1 1 A 1 ), due to change from C 2v ground state to C S excited state symmetry. 34 The origin of the band has been identified at 5.297 eV 35 from temperature dependent experiments on carbonyl sulphide, whereas in the present work, we propose the (0-0) transition at 5.267 eV. The fine structure is primarily attributed to excitation of the ν ′ 1 stretching mode (see Table I for the proposed assignments) with a contribution from ν ′ 2 bending mode.…”

ABSORPTION CROSS SECTION OF GASEOUS ACETYLENE AT 85 K IN THE WAVELENGTH RANGE 110-155 nm

“…To assess an interference from acetone, we measured the absorption cross sections of acetone under the same conditions; results in the spectral region 106-170 nm are displayed in Figure 3. For the most prominent absorption of acetone at 153.22 nm, the cross section is 68 Mb (Nobre et al 2008). Testing our absorption of C 2 H 2 in Figure 2(a), we measured no absorption line at 153.22 nm; thus, in our target sample acetone cannot perturb the accuracy of our cross sections of C 2 H 2 .…”

Photoabsorption spectroscopy of dimethyl sulfoxide at the O1s, C1s, S2s, and S2p Regions: A comparison with acetone

“…Experimental and theoretical studies of electronic structure of the ground and excited states, as well as the electronic transition probabilities for the valence and the inner shell electrons for both DMSO and acetone, have been done in the past 40 years. These molecules have been excited at the valence7–14 and inner shell regions,8, 15–21 using synchrotron radiation and electron energy loss, or laser spectrometers. Theoretical studies have been done for both DMSO1, 3, 22–24 and acetone,25–29 in the valence region, mainly using configuration interaction methods.…”