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J/ApJ/833/9    Rotational frequencies of TiO isotopologues    (Lincowski+, 2016)

Millimeter/submillimeter spectroscopy of TiO (X3Δr): the rare titanium isotopologues. Lincowski A.P., Halfen D.T., Ziurys L.M. <Astrophys. J., 833, 9-9 (2016)> =2016ApJ...833....9L (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Spectra, millimetric/submm Keywords: astrochemistry; ISM: molecules; line: identification; methods: laboratory: molecular; molecular data Abstract: Pure rotational spectra of the rare isotopologues of titanium oxide, 46TiO, 47TiO, 49TiO, and 50TiO, have been recorded using a combination of Fourier transform millimeter-wave (FTmmW) and millimeter/submillimeter direct absorption techniques in the frequency range 62-538GHz. This study is the first complete spectroscopic characterization of these species in their X3Δr ground electronic states. The isotopologues were created by the reaction of N2O or O2 and titanium vapor, produced either by laser ablation or in a Broida-type oven, and observed in the natural Ti isotopic abundances. Between 10 and 11 rotational transitions J+1←>J were measured for each species, typically in all 3 spin-orbit ladders Ω=1, 2, and 3. For 47TiO and 49TiO, hyperfine structure was resolved, originating from the titanium-47 and titanium-49 nuclear spins of I=5/2 and 7/2, respectively. For the Ω=1 and 3 components, the hyperfine structure was found to follow a classic Lande pattern, while that for Ω=2 appeared to be perturbed, likely a result of mixing with the nearby isoconfigurational a1Δ state. The spectra were analyzed with a case (a) Hamiltonian, and rotational, spin-orbit, and spin-spin parameters were determined for each species, as well as magnetic hyperfine and electric quadrupole constants for the two molecules with nuclear spins. The most abundant species, 48TiO, has been detected in circumstellar envelopes. These measurements will enable other titanium isotopologues to be studied at millimeter wavelengths, providing Ti isotope ratios that can test models of nucleosynthesis. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 81 160 Observed rotational transitions of titanium oxide (TiO) isotopologues (X3Δr)
See also: J/A+A/551/A113 : Spectrum of VY CMa in 220.65-224.25GHz range (Kaminski+, 2013) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Species TiO Isotopologue Species 7- 8 I2 --- J1 [2/17] Upper J quantum number 10- 11 I2 --- J0 [1/16] Lower J quantum number 13- 16 F4.1 --- F1 [0.5/19.5]? Upper F quantum number 18- 21 F4.1 --- F0 [1.5/18.5]? Lower F quantum number 23- 32 F10.3 MHz Freq1 [62687/532616] Frequency of the transition for Ω=1 34- 39 F6.3 MHz (O-C)1 [-0.3/0.2]? Observed minus calculated value for Freq1 41 A1 --- f_(O-C)1 [a] Flag on (O-C)1 (1) 43- 52 F10.3 MHz Freq2 [221900/538598]? Frequency of the transition for Ω=2 54- 59 F6.3 MHz (O-C)2 [-0.3/0.3]? Observed minus calculated value for Freq2 61 A1 --- f_(O-C)2 [a] Flag on (O-C)2 (1) 63- 72 F10.3 MHz Freq3 [224069/522730]? Frequency of the transition for Ω=3 74- 79 F6.3 MHz (O-C)3 [-0.3/0.3]? Observed minus calculated value for Freq3 81 A1 --- f_(O-C)3 [ab] Flag on (O-C)3 (1)
Note (1): Flag as follows: a = Blended line, not included in fit. b = Beyond range of frequency source, not measured.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Mar-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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