J/PAZh/33/143 Laboratory studies of HNCO (Lapinov+, 2007)
Laboratory studies of the HNCO molecular spectrum for precise spectroscopy
of dark clouds.
Lapinov A.V., Golubiatnikov G.Yu., Markov V.N., Guarnieri A.
<Pis'ma Astron. Zh. 33, 143 (2007)>
=2007PAZh...33..143L 2007PAZh...33..143L
=2007AstL..33...121L 2007AstL..33...121L
ADC_Keywords: Atomic physics; Interstellar medium
Abstract:
Detailed studies of the internal motions of dark clouds using spectral
lines of many molecules require a laboratory frequency accuracy of the
order of a few m/s. Based on our laboratory studies of the HNCO
rotational spectrum in the ground vibration state, we have increased
significantly the accuracy of frequency calculations in a wide range of
quantum numbers. We have achieved an 1σ uncertainty for
rotational transitions in the Ka=0,1 states recalculated to the
Doppler velocity scale <2m/s for all frequencies <1.1THz. This value
allows radio-astronomical measurements with an accuracy comparable to
that of the highest-precision observations based on spectral lines of
other molecules.
Description:
The Tables list laboratory measured microwave HNCO frequencies and
calculated rotational spectrum. Reported values correspond to
hyperfine usplit centers of listed transitions. Used in the fit
Infrared Fourier spectra are not listed.
Objects:
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RA (2000) DE Designation(s)
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04 27 46.4 +26 17 52 B 217 SW = [HHL2001] B217SW
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 54 205 HNCO a-type rotational frequencies (MHz) measured
with microwave techniques (hf unperturbed centers)
table2.dat 54 41 HNCO b-type rotational frequencies (MHz) measured
with microwave techniques (hf unperturbed centers)
table3.dat 54 13 HNCO Q-type rotational frequencies (MHz) within Ka=1
doublet measured with microwave techniques
(hf unperturbed centers)
table6.dat 50 148 Calculated HNCO rotational frequencies (MHz) for
Ka=0,1 using spectroscopic constants from
Table 4 of the paper
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Byte-by-byte Description of file: table1.dat table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- J J quantum number of upper energy level
5 I1 --- Ka Ka quantum number of upper energy level
8- 9 I2 --- Kc ? Kc quantum number of upper energy level (1)
12- 13 I2 --- J' J quantum number of lower energy level
16 I1 --- Ka' Ka quantum number of lower energy level
19- 20 I2 --- Kc' ? Kc quantum number of lower energy level
23- 34 F12.4 MHz Freq frequency of transition
37- 42 F6.4 MHz e_Freq Uncertainty in Freq
45- 51 F7.4 MHz O-C (Observed - calculated) frequency
54 I1 --- Ref Reference (2)
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Note (1): Kc quantum number is not determined for Ka>2 because of
unresolved splitting
Note (2): References as follows:
1 = Kukolich et al., 1971, J. Am. Chem. Soc. 93, 6769
2 = Hocking et al., 1975, Can. J. Phys. 53, 1869
3 = this work
4 = Kewley et al., 1963, J. Mol. Spectrosc. 10, 418
5 = Niedenhoff et al., 1995, J. Mol. Spectrosc. 174, 151
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- J J quantum number of upper energy level
5 I1 --- Ka Ka quantum number of upper energy level
8- 9 I2 --- Kc Kc quantum number of upper energy level
12- 13 I2 --- J' J quantum number of lower energy level
16 I1 --- Ka' Ka quantum number of lower energy level
19- 20 I2 --- Kc' Kc quantum number of lower energy level
23- 35 F13.5 MHz Freq Calculated frequency of transition
38- 44 F7.5 MHz e_Freq Uncertainty in Freq (1)
47- 50 F4.2 m/s sigV Estimated uncertainty in Doppler velocity scale
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Note (1): Estimated uncertainties are based on the propagation of
spectroscopic constants' errors including correlation between constants
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(End) Veta Avedisova (INASAN) 13-Aug-2007