J/ApJ/783/L5 Ro-vibration transitions of the protonated argon ion (Cueto+, 2014)
New accurate measurement of 36ArH+ and 38ArH+ ro-vibrational transitions
by high resolution IR absorption spectroscopy.
Cueto M., Cernicharo J., Barlow M.J., Swinyard B.M., Herrero V.J.,
Tanarro I., Domenech J.L.
<Astrophys. J., 783, L5 (2014)>
=2014ApJ...783L...5C 2014ApJ...783L...5C (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: ISM: molecules - methods: laboratory: molecular - molecular data -
techniques: spectroscopic
Abstract:
The protonated argon ion, 36ArH+, was recently identified in the
Crab Nebula from Herschel spectra. Given the atmospheric opacity at
the frequency of its J=1-0 and J=2-1 rotational transitions (617.5 and
1234.6GHz, respectively), and the current lack of appropriate space
observatories after the recent end of the Herschel mission, future
studies on this molecule will rely on mid-infrared observations. We
report on accurate wavenumber measurements of 36ArH+ and
38ArH+ rotation-vibration transitions in the v=1-0 band in the
range 4.1-3.7µm (2450-2715/cm). The wavenumbers of the R(0)
transitions of the v=1-0 band are 2612.50135±0.00033 and
2610.70177±0.00042/cm(±3σ) for 36ArH+ and 38ArH+,
respectively. The calculated opacity for a gas thermalized at a
temperature of 100K and with a linewidth of 1km/s of the R(0) line is
1.6x10-15xN(36ArH+). For column densities of 36ArH+ larger
than 1x1013/cm2, significant absorption by the R(0) line can be
expected against bright mid-IR sources.
Description:
We did accurate laboratory measurement of 19 lines of the v=1-0 band
of 36ArH+ and 38ArH+. The new wavenumbers have improved the
Dunham-type fit to all published rotation and vibration-rotation data
for all isotopologues of this molecule, allowing more accurate
predictions of other transitions for any of them.
Table3 contains all published observed frequencies of all
isotopologues, as well as the values calculated from our fit.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 88 367 Measured and calculated ro-vibrational transitions
of the isotopologues of ArH+
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See also:
J/ApJ/799/115 : Absorption spectrum of SO up to 2.5THz (Martin-Drumel+, 2015)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Iso Isotopologue (36ArD+, 36ArH+,
38ArD+, 38ArH+, 40ArD+, or
40ArH+)
12- 13 I2 --- J' [0/36] Upper level J quantum number Ju
15- 16 I2 --- J" [0/35] Lower level J quantum number Jl
18 I1 --- v' [0/7] Upper level vibrational state vu
20 I1 --- v" [0/6] Lower level vibrational state vl
22- 27 A6 --- x_Freq1 Frequency units (MHz or cm-1) (1)
29- 41 F13.4 --- Freq1 [404/1.33e+07] Observed frequency νobs
43- 50 F8.5 --- e_Freq1 [0/50] The 1σ uncertainty in Freq1 (2)
52- 66 F15.6 --- Freq2 [404/1.3311e+07] Predicted frequency νcal
68- 75 F8.6 --- e_Freq2 [2e-05/6.6] The 1σ uncertainty in Freq2
77- 86 F10.6 --- O-C [-54/30] The νobs-νcal difference
88 I1 --- Ref [1/9] Reference code (3)
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Note (1): These units apply to all the elements of each row.
Note (2): Transitions with e_Freq1=0 have been discarded in the fit due to a
large O-C value.
Note (3): Reference code defined as follows:
1 = This work;
2 = Filgueira & Blom (1988JMoSp.127..279F 1988JMoSp.127..279F);
3 = Bowman et al. (1983JChPh..79.2093B 1983JChPh..79.2093B);
4 = Brown et al. (1988JMoSp.128..587B 1988JMoSp.128..587B);
5 = Liu et al. (1987JChPh..87.2442L 1987JChPh..87.2442L);
6 = Brault & Davis (1982PhyS...25..268B 1982PhyS...25..268B);
7 = Johns (1984JMoSp.106..124J 1984JMoSp.106..124J);
8 = Laughlin et al. (1988RSPTA.324..109L 1988RSPTA.324..109L);
9 = Odashima et al. (1999JMoSp.195..356O 1999JMoSp.195..356O).
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History:
From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 15-Apr-2016