XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
282
T5: P–2
Fourier-Transform spectroscopy and deperturbation analysis of the
Ångström (B
1
Ʃ
+
– A
1
Π) system in
12
C
18
O
Rafał Hakalla
1
, Wojciech Szajna
1
, Mirosław Zachwieja
1
, Izabela Piotrowska
1
,
Małgorzata Ostrowska-Kopeć
1
, Przemysław Kolek
1
, and Ryszard Kępa
1
1
Materials Spectroscopy Laboratory, Department of Experimental Physics, Faculty of Mathematics
and Natural Science, University of Rzeszów, ul. Prof. S. Pigonia 1, 35-959 Rzeszów, Poland,
e-mail: hakalla@ur.edu.pl
The A
1
Π (v = 0) level of
12
C
18
O has been reinvestigated using Fourier–transform spectroscopy
(1.71 m Bruker IFS 125 – HR spectrometer at the University of Rzeszów) probing visible wavelength
emission spectra B
1
Ʃ
+
– A
1
Π (0, 0) band under 0.018 cm
–1
high–resolution. The discharge was
conducted in the air–cooled, carbon hollow–cathode (HC) lamp. The temperature of dc–plasma at the
center of the cathode was 900 K. The estimated absolute calibration uncertainty (1σ) was 0.003 cm
–1
.
The fitting uncertainty of the line frequency measurements is estimated to be 0.003 cm-1 for single
medium-strength lines and 0.01–0.02 cm
–1
for weak and/or blended ones.
An effective–Hamiltonian deperturbation analysis of A
1
Π (v = 0) level was performed up to J =
40 and quantitatively addressing interactions by the e
3
Ʃ
–
(v = 1), d
3
Δ
i
(v = 4), a′
3
Ʃ
+
(v = 9), D
1
Δ (v =
0), and I
1
Ʃ
–
(v = 0, 1) rovibrational levels. The present investigation is one of a series analyzing
perturbations in low–v levels of the A
1
Π state in detail for various isotopologues of the carbon
monoxide molecule. These studies have provided a highly accurate picture of levels and perturbations
for levels of A
1
Π in the
12
C
16
O main isotopologue [1],
13
C
16
O [2],
12
C
17
O [3],
13
C
17
O [4], and
12
C
18
O
[this work].
Fig. 1. High-resolution B
1
Ʃ
+
– A
1
Π
(0, 0) emission band in
12
C
18
O recorded by 1.71m FT spectrometer.
Keywords: high-resolution FT spectroscopy; deperturbation analysis, Ångström system;
12
C
18
O isotopologue.
References
[1] M.L. Niu, E.J. Salumbides, A.N. Heays, N. de Oliveira, R.W. Field, W. Ubachs, Mol. Phys. 114 (2016) 627.
[2] M.L. Niu, R.Hakalla, T.M. Trivikram, A.N. Heays, N. de Oliveira, E.J. Salumbides, W. Ubachs, Mol. Phys.
114 (2016) 2857.
[3] R. Hakalla, M.L. Niu, R.W. Field, E.J. Salumbides, A.N. Heays, G. Stark, J.R. Lyons, M. Eidelsberg, J.L.
Lemaire, S.R. Federman, et al., Roy. Soc. Chem. Adv. 6 (2016) 31588.
[4] R. Hakalla, M. Niu, R. Field, A. Heays, E. Salumbides, G. Stark, J. Lyons, M. Eidelsberg, J. Lemaire, S.
Federman, et al., J. Quant. Spectr. Rad. Transfer 189 (2017) 312.
XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
283
T5: P–3
First FT spectroscopy of the comet-tail (A
2
Π
i
– X
2
Ʃ
+
) system bands
in
12
C
17
O
+
Izabela Piotrowska
1
, Małgorzata Ostrowska-Kopeć
1
, Rafał Hakalla
1
,
Wojciech Szajna
1
, Mirosław Zachwieja
1
, Przemysław Kolek
1
, and Ryszard Kępa
1
1
Materials Spectroscopy Laboratory, Department of Experimental Physics, Faculty of Mathematics
and Natural Science, University of Rzeszów, ul. Prof. S. Pigonia 1, 35-959 Rzeszów, Poland,
e-mail: ipiotrowska@ur.edu.pl
In the emission spectrum of
12
C
17
O
+
molecule new observations and analyses were
performed. Two bands (0–2 and 1–1) of the Comet–Tail (A
2
Π
i
– X
2
Ʃ
+
) system in the 19850 to
15250 cm
–1
region were recorded with the Fourier transform spectrometer (BRUKER IFS 125-
HR).
The absolute accuracy of wavenumbers was about 0.003 cm
–1
. The measurement cycle
included 128 scans within 1.5 h. As a source of the studied spectrum an air-cooled, carbon
hollow-cathode (HC) lamp operated at 780 V, 54 mA dc was used. The lamp was filled with a
static mixture of
17
O
2
(70 %) and
16
O
2
(30 %) at a pressure of 3 mbar. During the discharge
process, the O
2
molecules react with the 12C atoms ejected from the carbon filler placed inside
the cathode, thus forming
12
C
17
O and
12
C
17
O
+
molecules in the gas phase, in amounts sufficient
to finally achieve a signal-to-noise ratio (SNR) of 100:1.
Spectra were analyzed using a commercial software OPUS which finds peaks and calculates
various spectral parameters (wavenumbers, FWHM, etc). As a result of a detailed spectral
analysis the individual molecular constants of both A
2
Π
i
and X
2
Ʃ
+
states were obtained. For the
upper A
2
Π
i
state all these constants were delivered for the first time. The parameters for the
lower X
2
Ʃ
+
state were also calculated and compared with these determined previously [1–3].
Fig. 1. B
1
Ʃ
+
– A
1
Π
bands in
12
C
17
O and A
2
Π
i
– X
2
Ʃ
+
bands in
12
C
17
O
+
.
Keywords: FT spectroscopy; Comet-tail system; 12C17O+ molecule
References
[1] W. Szajna, R. Kępa, Spectrochim. Acta A 65 (2006) 1014.
[2] W. Szajna, R. Kępa, R. Hakalla, M. Zachwieja, J. Mol. Spectrosc. 240 (2006) 75.
[3] W. Szajna, R. Kępa, R. Hakalla, M. Zachwieja, Spectrosc. Lett. 40 (2007) 667.
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