J/A+A/492/875 Rest frequencies for C3O (Bizzocchi+, 2008)
Accurate rest frequencies for the submillimetre-wave lines of C3O in ground and
vibrationally excited states below 400 cm-1.
Bizzocchi L., Degli Esposti C., Dore L.
<Astron. Astrophys. 492, 875 (2008)>
=2008A&A...492..875B 2008A&A...492..875B
ADC_Keywords: Atomic physics
Keywords: molecular data - methods: laboratory - techniques: spectroscopic -
radio lines: ISM
Abstract:
The submillimetre-wave spectrum of C3O (X1Σ+) has been
investigated in the laboratory using a source-modulation microwave
spectrometer equipped with a gas-phase flow pyrolysis system for the
production of unstable chemical species. C3O was produced by thermal
decomposition of fumaryl chloride at 900°C. Thirty-seven new
rotational transitions were observed in the frequency range 307-740GHz
for the ground vibrational state, reaching a J quantum number as high
as 76. Additionally, new millimetre-wave and submillimetre-wave lines
were recorded for the bending fundamental v5=1, and for its overtone
v5=2 and v5=3 whose rotational spectra have been identified for
the first time. The new laboratory measurements provide much improved
rest frequencies in the submillimetre spectral region for the ground
state spectra of C3O, and for the first levels of its low-energy v5
vibrational ladder, useful for the radioastronomical identification of
the irrotational lines in the ISM.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table5.dat 31 84 Predicted rest-frequencies and estimated 1σ
uncertainties (MHz) for C3O in its
vibrational ground state
table6.dat 31 162 Predicted rest-frequencies and estimated 1σ
uncertainties (MHz) for C3O in the
v5=1 vibrationally excited state
table7.dat 31 239 Predicted rest-frequencies and estimated 1σ
uncertainties (MHz) for C3O in the
v5=2 vibrationally excited state
table8.dat 31 316 Predicted rest-frequencies and estimated 1σ
uncertainties (MHz) for C3O in the
v5=3 vibrationally excited state
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat table6.dat table7.dat table8.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- J' Upper state quantum number
4 A1 --- --- [-]
6- 7 I2 --- J Lower state quantum number
10- 11 A2 --- l5 l quantum number (l5) (no values for table5)
13- 24 F12.4 MHz Freq Calculated rest frequency
26- 31 F6.4 MHz e_Freq rms uncertainty on RFreq
--------------------------------------------------------------------------------
Acknowledgements:
Luca Bizzocchi, luca.bizzocchi(at)unibo.it
(End) Patricia Vannier [CDS] 14-Oct-2008