J/A+A/548/A71 Spectroscopy and ISM detection of formamide (Motiyenko+, 2012)
Rotational spectrum of formamide up to 1 THz and first ISM detection of its
v12 vibrational state.
Motiyenko R. A., Tercero B., Cernicharo J., Margules L.
<Astron. Astrophys. 548, A71 (2012)>
=2012A&A...548A..71M 2012A&A...548A..71M
ADC_Keywords: Atomic physics
Keywords: line: identification - astronomical databases: miscellaneous -
ISM: molecules - submillimeter: ISM -
ISM: individual objects: Orion KL
Abstract:
Formamide is the simplest bearer of peptide bond detected in the
interstellar medium (ISM).
There still exists a lack of laboratory data on its rotational
spectrum in THz domain.
We measured the rotational spectrum of formamide in the frequency
range 400-950GHz. The ground and the first excited vibrational
state of the normal species as well as the ground state of 13C
isotopic species were analysed.
The results obtained represent an extension by a factor of two in
frequency range com- pared to previous studies. Among all transitions
frequencies in the dataset about 45% are new measurements. A reliable
set of rotational constants allows accurate predictions of transition
frequencies in THz domain. Based on the spectroscopic results the
v12=1 excited vibrational state of formamide was detected in the IRAM
30m line survey of Orion KL for the first time in the ISM.
Description:
We provide 3 tables correspondingly for the ground and v=12 states of
the parent isotopologue and for the ground state of 13C isotopologue
of formamide. The tables contain line assignments, observed
frequencies, residuals of the fits using A-reduction of the Watson's
Hamiltonian and accuracy of frequency measurement. The quantum number
F is indicated only for the transitions with resolved or partially
resolved hyperfine structure.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 71 2200 Assigned rotational transitions of the ground
state of the parent isotopologue of formamide
table5.dat 71 1609 Assigned rotational transitions of the v12=1
state of the parent isotopologue of formamide
table6.dat 71 525 Assigned rotational transitions of the ground
state of the 13C isotopologue of formamide
--------------------------------------------------------------------------------
See also:
J/A+A/544/A82 : Rotational spectroscopy of diisocyanomethane (Motiyenko+, 2012)
Byte-by-byte Description of file: table4.dat table5.dat table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 3 I2 --- J" Upper J quantum number
5- 6 I2 --- Ka" Upper Ka quantum number
8- 9 I2 --- Kc" Upper Kc quantum number
11- 12 I2 --- F" ? Upper F quantum number
16- 17 I2 --- J' Lower J quantum number
19- 20 I2 --- Ka Lower Ka quantum number
22- 23 I2 --- Kc' Lower Kc quantum number
25- 26 I2 --- F' ? Lower F quantum number
29- 41 F13.4 MHz Freq Observed transition frequency
44- 50 F7.4 MHz O-C Individual residuals of the fit
53- 57 F5.3 MHz e_Freq Uncertainty of measurements
60- 66 F7.4 MHz O-Cbl ? Residuals of the blended components
68- 71 F4.2 --- Ibl ? Relative intensity for blended line components
--------------------------------------------------------------------------------
Acknowledgements:
Roman Motiyenko, roman.motienko(at)univ-lille1.fr
(End) Roman Motiyenko [PhLAM, Lille 1], Patricia Vannier [CDS] 03-Oct-2012