J/A+A/565/A66 Ketenimine (CH2CNH) submm rest-frequencies (Degli Esposti+, 2014)
Accurate rest-frequencies of ketenimine (CH2CNH) at submillimetre wavelength.
Degli Esposti C., Dore L., Bizzocchi L.
<Astron. Astrophys. 565, A66 (2014)>
=2014A&A...565A..66D 2014A&A...565A..66D
ADC_Keywords: Atomic physics
Keywords: molecular data - methods: laboratory - techniques: spectroscopic -
radio lines: ISM
Abstract:
Imine compounds are thought to have a role in the interstellar
formation of complex organic species, including pre-biotic molecules.
Ketenimine (CH2CNH) is one of the four imines discovered in space.
It was identified in Sgr B2(N-LMH) through the detection of three
rotational lines in absorption.
We present an extensive laboratory study of the ground-state
rotational spectrum of CH2CNH at submillimetre wavelengths, aimed at
obtaining accurate rest-frequencies for radio-astronomical searches.
The investigation was carried out using a source-modulation microwave
spectrometer equipped with a cell that is coupled to a pyrolysis
apparatus working at 1000°. The spectrum was recorded in the
frequency range 80-620GHz with the detection of 150 transitions.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 95 297 Assignments, measured line positions, and
least-squares residuals for the analysed
transitions of ketenimine
table3.dat 91 954 Predicted rest frequencies, estimated
accuracies, and lines strengths for the ground
vibrational state of ketenimine
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
4- 5 I2 --- J1 [1/67] Upper state rotational quantum number J
7 A1 --- --- [(]
9 I1 --- Ka1 [0/9] Upper state rotational quantum number Ka
10 A1 --- --- [,]
11- 12 I2 --- Kc1 [0/66]?=* Upper state rotational quantum number Kc
(* unresolved asymmetry doublets)
13 A1 --- --- [)]
16- 17 I2 --- F1 [0/57]?=- Upper state 'total' quantum number F
24- 25 I2 --- J0 [0/67] Lower state rotational quantum number J
27 A1 --- --- [(]
29 I1 --- Ka0 [0/9] Lower state rotational quantum number Ka
30 A1 --- --- [,]
31- 32 I2 --- Kc0 [0/66]?=* Lower state rotational quantum number Kc
(* unresolved asymmetry doublets)
33 A1 --- --- [)]
36- 37 I2 --- F0 [0/56]?=- Lower state 'total' quantum number F
42- 53 F12.5 --- Obs Measured line position (MHz or cm-1)
60- 67 F8.5 --- O-C Lest-squares residual (MHz or cm-1, see text)
72- 78 F7.5 --- Unc assumed uncertainty (MHz or cm-1)
85- 88 A4 --- x_Obs Unit for Obs, O-C and Unc (MHz or cm-1)
95 I1 --- Ref [1/3] Reference paper (1)
--------------------------------------------------------------------------------
Note (1): References as follows:
1 = Bane et al., 2011b, Journal of Chemical Physics, 135, 224306
2 = Rodler et al., 1984
3 = present work
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
4- 5 I2 --- J1 [1/14] Upper state rotational quantum number J
7 A1 --- --- [(]
9 I1 --- Ka1 [0/3] Upper state rotational quantum number Ka
10 A1 --- --- [,]
11- 12 I2 --- Kc1 [0/14] Upper state rotational quantum number Kc
13 A1 --- --- [)]
16- 17 I2 --- F1 [0/15]?=- Upper state 'total' quantum number F
24- 25 I2 --- J0 [1/14] Lower state rotational quantum number J
27 A1 --- --- [(]
29 I1 --- Ka0 [0/2] Lower state rotational quantum number Ka
30 A1 --- --- [,]
31- 32 I2 --- Kc0 [0/13] Lower state rotational quantum number Kc
33 A1 --- --- [)]
36- 37 I2 --- F0 [0/14]?=- Lower state 'total' quantum number F
44- 53 F10.3 MHz freq0 Rest frequency (1)
55 A1 --- --- [(]
56- 57 I2 kHz e_freq0 Estimated 1σ error of the prediction
58 A1 --- --- [)]
62- 70 E9.4 D+2 LStr Transition strength (Debye2)
74- 79 F6.3 cm-1 E1 Upper state energy
83- 91 E9.4 s-1 A Einstein's A coefficient
--------------------------------------------------------------------------------
Note (1): evaluated from the spectroscopic constants of the 2nd column of
Table 2.
--------------------------------------------------------------------------------
Acknowledgements:
Luca Dore, luca.dore(at)unibo.it
(End) Patricia Vannier [CDS] 09-Apr-2014