J/ApJS/169/472 Swan system of C2 (Tanabashi+, 2007)
The Swan system of C2: a global analysis of Fourier transform emission
spectra.
Tanabashi A., Hirao T., Amano T., Bernath P.F.
<Astrophys. J. Suppl. Ser., 169, 472-484 (2007)>
=2007ApJS..169..472T 2007ApJS..169..472T
ADC_Keywords: Interstellar medium ; Atomic physics ; Spectroscopy
Keywords: astrochemistry - ISM: clouds - ISM: molecules - methods: laboratory -
molecular data - stars: late-type
Abstract:
The C2 Swan system (d 3Πg-a 3Πu) was observed in
emission for the Δv=-3 to Δv=+2 sequences in the
14000-24000cm-1 spectral range using a Fourier transform
spectrometer. We carried out a global simultaneous fit by including
a wide range of vibrational states. A total of 34 bands with v'=0-10
and v"=0-9 were rotationally assigned. Numerous discrepancies
were found in the assignments and in the measured transition
wavenumbers between the new measurements and previous results.
Most of the measured transition wavenumbers and their assignments for
relatively low-v bands agreed with published data. On the contrary,
for high-v bands our line positions and assignments disagreed with the
tabulated literature values. In particular, the lines of six bands
involving the levels with v'=4, 5, and 6 are almost completely
different from the previous work. Major sources of the disagreement
are thought to be line congestion and perturbations found in these
bands. From the analysis, perturbations for v'=0, 1, 2, 4, 6, 8, 9,
and 10 in the d 3Πg state were identified. A study of these
rotational perturbations suggest that some of them are likely caused
by interactions with high-v levels of the b 3Σ-g state.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table7.dat 167 1081 Transition Wavenumbers of the Swan System
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- v' The v' vibrational level
4 I1 --- v" The v" vibrational level
6- 7 I2 --- J" The J" rotational level
9- 17 F9.3 cm-1 P3(J) ? The P3 branch vacuum wavenumber (1)
18 A1 --- r_P3(J) Transition from from Tanabashi & Amano (2)
20- 25 I6 10-3cm-1 D_P3(J) ? The (O-C) value for P3(J) (3)
27 A1 --- n_P3(J) Categorization of P3(J) (4)
29- 37 F9.3 cm-1 R3(J) ? The R3 branch vacuum wavenumber (1)
38 A1 --- r_R3(J) Transition from from Tanabashi & Amano (2)
40- 45 I6 10-3cm-1 D_R3(J) ? The (O-C) value for R3(J) (3)
47 A1 --- n_R3(J) Categorization of R3(J) (4)
49- 57 F9.3 cm-1 P2(J) ? The P2 branch vacuum wavenumber (1)
58 A1 --- r_P2(J) Transition from from Tanabashi & Amano (2)
60- 65 I6 10-3cm-1 D_P2(J) ? The (O-C) value for P2(J) (3)
67 A1 --- n_P2(J) Categorization of P2(J) (4)
69- 77 F9.3 cm-1 R2(J) ? The R2 branch vacuum wavenumber (1)
78 A1 --- r_R2(J) Transition from from Tanabashi & Amano (2)
80- 85 I6 10-3cm-1 D_R2(J) ? The (O-C) value for R2(J) (3)
87 A1 --- n_R2(J) Categorization of R2(J) (4)
89- 97 F9.3 cm-1 P1(J) ? The P1 branch vacuum wavenumber (1)
98 A1 --- r_P1(J) Transition from from Tanabashi & Amano (2)
100-105 I6 10-3cm-1 D_P1(J) ? The (O-C) value for P1(J) (3)
107 A1 --- n_P1(J) Categorization of P1(J) (4)
109-117 F9.3 cm-1 R1(J) ? The R1 branch vacuum wavenumber (1)
118 A1 --- r_R1(J) Transition from from Tanabashi & Amano (2)
120-125 I6 10-3cm-1 D_R1(J) ? The (O-C) value for R1(J) (3)
127 A1 --- n_R1(J) Categorization of R1(J) (4)
129-137 F9.3 cm-1 Q2(J) ? The Q2 branch vacuum wavenumber (1)
138 A1 --- r_Q2(J) Transition from from Tanabashi & Amano (2)
140-145 I6 10-3cm-1 D_Q2(J) ? The (O-C) value for Q2(J) (3)
147 A1 --- n_Q2(J) Categorization of Q2(J) (4)
149-157 F9.3 cm-1 Q1(J) ? The Q1 branch vacuum wavenumber (1)
158 A1 --- r_Q1(J) Transition from from Tanabashi & Amano (2)
160-165 I6 10-3cm-1 D_Q1(J) ? The (O-C) value for Q1(J) (3)
167 A1 --- n_Q1(J) Categorization of Q1(J) (4)
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Note (1): In P and R branches the odd J" transitions represent the (e)-(e)
transitions and the even J" transitions the (f)-(f) transitions. For Q
branch lines, the odd J" transitions represent the (f)-(e) transitions
and the even J" transitions the (e)-(f) transitions.
Note (2): The asterisk (*) indicates transitions wavenumbers are taken from
Tanabashi & Amano (2002JMoSp.215..285T 2002JMoSp.215..285T).
Note (3): The (O-C) value is left blank for blended lines which show
apparent broadening or shoulder, and the calculated transition
wavenumbers are listed.
Note (4): Note as follows:
a = Well resolved isolated lines.
b = Lines with a strange line shape due to overlap with other lines,
and they are included in the fit with reduced weight.
c = Blended lines or lines slightly shifted by perturbations,
but included in the fit with reduced weight.
p = Extra lines caused by a perturbing state to the d3Πg state.
y = Perturbed lines, or most heavily overlapped lines, not included in
the fit. However, identifications are certain.
z = Not identified, the calculated wavenumbers are listed.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 30-Apr-2009