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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 81 160 Observed rotational transitions of titanium oxide
(TiO) isotopologues (X3Δr)
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): Flag as follows:
a = Blended line, not included in fit.
b = Beyond range of frequency source, not measured.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Mar-2017