Emission spectra of group IV monohalide ions: , 3Π1–X1Σ+ emissions of SiBr+

1984 ◽  
Vol 62 (4) ◽  
pp. 353-360 ◽  
Author(s):  
M. Tsuji ◽  
K. Shinohara ◽  
S. Nishitani ◽  
T. Mizuguchi ◽  
Y. Nishimura
Keyword(s):  
Thermal Energy ◽  
Vibrational Temperature ◽  
Vibrational Analysis ◽  
Emission Spectra ◽  
Ionic Species ◽  
Group Iv ◽  
Rare Gas ◽  
Molecular Constants ◽  
Vibrational Levels ◽  
Effective Vibrational Temperature

Emission spectra of SiBr4 in the rare gas flowing afterglows have been measured to detect and identify SiBr+ emissions. Two systems of SiBr+ emissions were detected in the He, Ne, and Ar afterglows in the region from 335 to 380 nm. By analogy with the emission spectrum of SiCl+, they were ascribed to the [Formula: see text]–X1Σ+ and a3Π1–X1Σ+ subsystems of SiBr+. The vibrational analysis of the latter system gave the following molecular constants for the a3Π1 state: T0 = 29 140 ± 5 cm−1 and ΔG(1/2) = 392.0 ± 3.7 cm−1. The SiBr+ emissions disappeared when ionic species were removed from the afterglows, indicating that the emitting SiBr+ states were produced through thermal-energy reactions of rare gas ions with SiBr4. In the He and Ne afterglows, the [Formula: see text] ions were produced in higher vibrational levels than in the Ar afterglow. The relative vibrational populations in the He and Ne afterglows were nearly exponential with an effective vibrational temperature of 460 ± 30 K.

Spectrum of the CN molecule. I. Absorption in the vacuum ultraviolet

1970 ◽  
Vol 48 (10) ◽  
pp. 1192-1199 ◽  
Author(s):  
Barry L. Lutz
Keyword(s):  
Vacuum Ultraviolet ◽  
Band System ◽  
Vibrational Analysis ◽  
Electronic States ◽  
Ultraviolet Absorption Spectrum ◽  
Molecular Constants ◽  
Weak Band ◽  
Vibrational Levels ◽  
First Time ◽  
Π State

The vacuum ultraviolet absorption spectrum of CN is observed for the first time revealing a weak band system between 1490 and 1820 Å. Rotational and vibrational analysis shows the upper state to be the known E2Σ+ state. Four new vibrational levels are reported, resulting in the following molecular constants for the E state (cm−1):[Formula: see text]The strength of the absorption and its significance in astrophysics is discussed. The dissociation limits and the electron configurations of all known electronic states of CN are also discussed, and a tentative assignment of a previously unassigned 2Π state is proposed.

Vibrational analysis of the 3Π1–X1Σ+ band systems of SiCl+

1981 ◽  
Vol 59 (8) ◽  
pp. 985-989 ◽  
Author(s):  
Masaharu Tsuji ◽  
Toshinori Mizuguchi ◽  
Yukio Nishimura
Keyword(s):  
Emission Spectrum ◽  
Radical Cation ◽  
Thermal Energy ◽  
Vibrational Analysis ◽  
Molecular Constants ◽  
Vibrational Assignments

The emission spectrum of the SiCl+ radical cation, excited by the thermal energy He+ + SiCl4 reaction, has been observed and vibrationally analyzed in the 310–350 nm region. The two new subband systems, [Formula: see text] and a3Π1–X1Σ+, have been identified. The vibrational assignments were confirmed by the observed isotope band heads of Si35Cl+ and Si37Cl+. The following molecular constants (in cm−1) have been obtained for the X1Σ+, [Formula: see text], and a3Π1, states.[Formula: see text]

OH(AΣ+2) and rare gas-deuteride (NeD, ArD) excimers generated in microcavity plasmas: Ultraviolet emission spectra and formation kinetics

2007 ◽  
Vol 90 (20) ◽  
pp. 201504 ◽  
Author(s):  
B. J. Ricconi ◽  
S.-J. Park ◽  
S. H. Sung ◽  
P. A. Tchertchian ◽  
J. G. Eden
Keyword(s):  
Emission Spectra ◽  
Rare Gas ◽  
Ultraviolet Emission ◽  
Formation Kinetics

Vibrational analysis of the low resolution absorption spectra of BrClCS and Br2CS

1988 ◽  
Vol 66 (3) ◽  
pp. 359-366 ◽  
Author(s):  
B. Simard ◽  
R. P. Steer ◽  
R. H. Judge ◽  
D. C. Moule
Keyword(s):  
Absorption Spectra ◽  
Room Temperature ◽  
Vibrational Analysis ◽  
Vibrational Frequencies ◽  
Low Resolution ◽  
Barrier Heights ◽  
Vibrational Levels ◽  
Out Of Plane ◽  
The Given

The [Formula: see text] absorption spectra of BrClCS and Br2CS have been photographed under low resolution at room temperature. The electronic origins of BrClCS and Br2CS have been placed at 17116 and 16859 cm−1, respectively. Vibronic analyses show that the molecules are non-planar in their ā states. By fitting quadratic–Gaussian and quadratic–quartic double-minimum potentials to the observed vibrational levels of the out-of-plane manifolds, the equilibrium out-of-plane angles and the barrier heights to molecular inversion have been estimated to be 25 ± 1 deg and 541 ± 10 cm−1 for BrClCS, and 17.5 ± 1 deg and 524 ± 10 cm−1 for Br2CS. In the case of BrClCS, all six ā state vibrational frequencies have been obtained. In the case of Br2CS, only modes 1 (C—S stretch), 2 (symmetric C—Br stretch), 3 (in-plane Br—C—Br scissor), and 4 (out-of-plane bend) are active in the spectrum. Comparisons with other tetraatomic thiocarbonyls support the given assignments.

The a3Π1–X1Σ+ emission system of CBr+

1983 ◽  
Vol 61 (2) ◽  
pp. 251-255 ◽  
Author(s):  
Masaharu Tsuji ◽  
Keiji Shinohara ◽  
Toshinori Mizuguchi ◽  
Yukio Nishimura
Keyword(s):  
Charge Transfer ◽  
Emission Spectrum ◽  
Thermal Energy ◽  
Transfer Reaction ◽  
Vibrational Analysis ◽  
Visible Emission ◽  
Spectroscopic Constants ◽  
Charge Transfer Reaction ◽  
Emission System ◽  
First Time

The visible emission spectrum of the CBr+ molecule has been observed for the first time in the helium afterglow reaction of CBr4. It was excited by the dissociative charge-transfer reaction of He+ with CBr4 at thermal energy. The vibrational analysis led to the following spectroscopic constants (in cm−1).[Formula: see text]

Emission Spectra of Deep Impurity States in Solid and Liquid Rare Gas Alloys

1972 ◽  
Vol 57 (11) ◽  
pp. 4628-4632 ◽  
Author(s):  
Ori Cheshnovsky ◽  
Baruch Raz ◽  
Joshua Jortner
Keyword(s):  
Emission Spectra ◽  
Rare Gas ◽  
Deep Impurity ◽  
Impurity States

Electronic spectra of metal ion – rare gas pairs: High resolution analysis of the A2Πr–X2Σ+ system of BeKr+

1977 ◽  
Vol 55 (3) ◽  
pp. 254-260 ◽  
Author(s):  
J. A. Coxon ◽  
W. E. Jones ◽  
K. V. Subbaram
Keyword(s):  
High Resolution ◽  
Metal Ion ◽  
Isotope Effects ◽  
Spin Splitting ◽  
Rare Gas ◽  
Molecular Constants ◽  
Naturally Occurring ◽  
High Resolution Analysis ◽  
Resolution Analysis ◽  
Splitting Constant

The A2Πr–X2Σ+ system of Be84Kr+ has been studied at high resolution in the region 3950–4265 Å. Rotational analyses have been performed for the 0–1, 0–0, 1–0, and 2–0 bands, and molecular constants have been determined by least squares fits of the line frequencies to model Hamiltonians. The regular nature of the excited state has been confirmed, despite the opposite signs found for the Λ-doubling constants, p and q. Comparisons of the Λ-doubling constants for the A2Πr state and of the spin-splitting constant (γ) for the X2Σ+ state have been made with those for other nine valence-electron diatomics. Although a systematic study of isotope effects due to the several isotopes of naturally-occurring krypton has not been possible, at least one branch of the 1–0 band of Be86Kr+ has been identified unequivocally.

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