J/ApJS/194/34 Fourier transform emission spectroscopy of 13C14N (Ram+, 2011)
Fourier transform emission spectroscopy of the B2Σ+-X2Σ+
(violet) system of 13C14N.
Ram R.S., Bernath P.F.
<Astrophys. J. Suppl. Ser., 194, 34 (2011)>
=2011ApJS..194...34R 2011ApJS..194...34R
ADC_Keywords: Spectroscopy ; Atomic physics
Keywords: comets: general - methods: laboratory - molecular data -
stars: abundances - stars: carbon - techniques: spectroscopic
Abstract:
Emission spectra of the B2Σ+-X2Σ+ transition of
13C14N have been observed at high resolution using the Fourier
transform spectrometer associated with the McMath-Pierce Solar
Telescope of the National Solar Observatory. The spectra have been
measured in the 21000-30000cm-1 region and a total of 52 vibrational
bands involving vibrational levels up to ν=15 of the ground and
excited states have been rotationally analyzed to provide a much
improved set of spectroscopic constants. An experimental line list and
calculated term values are provided. The results of the present
analysis should prove useful in the identification of additional
13C14N lines in comets and cool stars, and will help in the
determination of the 12C/13C abundance ratio.
Description:
Observations of CN now extend from the microwave to the vacuum
ultraviolet spectral regions and a number of electronic transitions
have been classified. Of these, the A2Π-X2Σ+ (red
system) and B2Σ+-X2Σ+ (violet system) transitions
have been extensively studied because of their astrophysical
importance.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
suppl1.txt 102 15625 Output of the least-squares fit of the combined
13C14N data
suppl2.dat 34 4982 Calculated term value in the different
vibrational levels of the states
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Description of file:
suppl1.txt provides the output of the least-squares fit of the
combined 13C14N data. The beginning of this table contains
spectroscopic constants for the different vibrational levels of the B,
A and X states. This is followed by the rotational assignments in the
different bands. For the B-X bands, the first two columns are labelled
as J and e/f parity for the excited state and the next two columns are
J and e/f parity of the ground state. The fifth column lists the
observed wavenumbers while the sixth column contains the observed
minus calculated wavenumbers. For the A-X bands the first three
columns are upper state J, e/f parity and F=1 (2Pi1/2) or 2 (2Pi3/2)
components of the A state and the next two columns are J and e/f
parity for the ground state. The label "J" is actually J+1/2 for all
electronic states. The sixth column contains the observed wavenumbers
of rotational lines and the seventh column contains corresponding
observed-minus calculate wavenumbers.
Byte-by-byte Description of file: suppl2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1,41] State number
4- 7 A4 --- System [2SIG/2PI ] 2SIGMA or 2PI (1)
9 A1 --- St [ABX] State
11- 12 I2 --- v [0,15] Vibrational level ν
14- 15 I2 --- J [1,50] Rotational level -1/2 (2)
17 A1 --- P [e/f] e/f parity level
19 I1 --- F [1/2]? For A state only (3)
21- 34 F14.8 --- Calc Calculated term value in the different
vibrational levels of the state
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Note (1): 2SIGMA for the violet system (B2Σ+-X2Σ+) or
2PI for the red system (A2Π-X2Σ+).
Note (2): the label "J" is actually J+1/2 for all the doublet states.
Note (3): For the A state, column F as follows:
1 = (2Π3/2) components
2 = (2Π1/2) components
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 08-Aug-2011