A New 1Δ–1ΔTransition of the TiO Molecule

1972 ◽  
Vol 50 (4) ◽  
pp. 312-316 ◽  
Author(s):  
C. Linton
Keyword(s):  
Microwave Discharge ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Strong Band

The TiO spectrum has been excited by a microwave discharge through a mixture of helium, oxygen, and TiCl4 vapor. A rotational analysis of a strong band at 5240.5 Å has shown that it is the 0,0 band of a transition from a new 1Δ state to the a1Δ state of the TiO molecule. The origin of the band is at ν0 = (19 068.95 ± 0.03) cm−1 and the rotational constants of the new 1Δ state are[Formula: see text]

The rotational analysis of the A1Π–X1Σ+ system of Si130Te

1992 ◽  
Vol 70 (5) ◽  
pp. 291-294 ◽  
Author(s):  
Sheila Gopal ◽  
M. Singh ◽  
G. Lakshminarayana
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Microwave Discharge ◽  
Band System ◽  
Rotational Structure ◽  
Quartz Tube ◽  
Rotational Analysis ◽  
Rotational Constants

The emission spectrum of Si130Te was excited by microwave discharge (2450 MHz) in a sealed quartz tube. The A1Π–X1Σ+ band system (3100–3900 Å) (1 Å = 10−10 m) photographed under high resolution on a 10.6 m Ebert grating spectrograph. The rotational analysis of 32 bands was carried out, which led to the determination of the accurate vibrational and rotational constants. The rotational structure belonging to ν′ > 9 levels appear to be perturbed.

Spectrum of SO: Analysis of the B3Σ−–X3Σ− and A3 Π–X3Σ− band systems

1969 ◽  
Vol 47 (9) ◽  
pp. 979-994 ◽  
Author(s):  
R. Colin
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Microwave Discharge ◽  
Flash Photolysis ◽  
Band System ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Π State

The absorption spectrum of SO radicals produced by flash photolysis of a mixture of COS + O2 + Ar is investigated. A partial rotational analysis of the previously known bands of the B3Σ−–X3Σ− transition which lie in the region of 1900 to 2400 Å is presented, and the predissociations and perturbations of the B3Σ−state are discussed. A complex red-degraded band system near 2500 Å, previously observed in emission and attributed to SO2, is shown to be due to a 3Π–X3Σ− transition of the SO molecule. Effective rotational constants of the 3Π state are derived from the analysis of these bands photographed at high resolution. In order to obtain the vibrational numbering of the 3Π–X3Σ− bands, these were also photographed in emission from a microwave discharge through a mixture of S18O2 + S16O2. A general discussion of the currently known states of the SO molecule is given.

Rotational Analysis of the Absorption Spectrum of Heavy Oxygen (18O2) in the Region 1200–1285 Å

1975 ◽  
Vol 53 (24) ◽  
pp. 2703-2711 ◽  
Author(s):  
Masaru Ogawa
Keyword(s):  
Absorption Spectrum ◽  
Rydberg States ◽  
Normal Incidence ◽  
Rotational Constant ◽  
Electron Configuration ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Strong Band

The absorption spectrum of 18O2 has been photographed with a 6.65 m normal incidence type vacuum spectrograph in the 1070–1300 Å region. Rotational structures of the following bands have been analyzed; 1–0, 2–0, 3–0, and 4–0 of α1Σu+ ← X3Σg−; 2–0and 3–0 of β3Σu+ ← X3Σg−; and a strong band at 1246 Å. The upper state of the 1246 Å band is determined to have 3Σu− symmetry, and the transition is designated E3Σu− ← X3Σg−. These three upper states are Rydberg in character, with electron configuration (πu2p)4(πg2p)(3pπ). The observed rotational constants of the α1Σu+ and β3Σu+ states are nearly identical to those of the X2Πg state of O2+ to which these three Rydberg states converge. However, the rotational constant of the E3Σu− state, B1 = 1.3702 cm−1, is much smaller than the value B1 = 1.4764 cm−1 for the X2Πg state of 18O2+ estimated from the corresponding 16O2+ value. A brief discussion of this discrepancy is given.

THE b1Σ+–X3Σ− BAND SYSTEM OF NCl

1967 ◽  
Vol 45 (2) ◽  
pp. 301-309 ◽  
Author(s):  
R. Colin ◽  
W. E. Jones
Keyword(s):  
High Resolution ◽  
Microwave Discharge ◽  
Band System ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Isotopic Shifts

When a mixture of N2 and Cl2 is pumped rapidly through a mild microwave discharge, an orange afterglow is observed downstream from the discharge. The spectrum of this weak emission consists of a prominent double-headed band, the strongest head lying at 6 648.6 Å, and a number of weaker similar bands forming three sequences. Observed isotopic shifts have been used to identify the emitter as NCl. The rotational analysis of the strongest (0–0) band, photographed with high resolution, shows that these bands represent the b1Σ+–X3Σ− transition of the NCl molecule. The vibrational and rotational constants were determined for both states; we find ωe′ = 935.6 cm−1, ωo″ = 827.0 cm−1, γ0′ = 1.565 3 Å, and γ0″ = 1.608 3 Å.

ROTATIONAL ANALYSIS OF THE β BANDS OF PHOSPHORUS MONOXIDE

1959 ◽  
Vol 37 (2) ◽  
pp. 136-143 ◽  
Author(s):  
Nand Lal Singh
Keyword(s):  
Ground State ◽  
Band System ◽  
Electronic States ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Fine Structures ◽  
Π State

The fine structures of three of the β bands of PO which occur near 3200 Å have been analyzed. The analysis shows that the upper state of this band system is a 2Σ and not a 2Π state as previously believed. The rotational constants of both electronic states have been determined and it is found that the ground state constants, previously determined from the γ bands, are incorrect.

THE EMISSION SPECTRUM OF THE PbBr MOLECULE

1967 ◽  
Vol 45 (11) ◽  
pp. 3663-3666 ◽  
Author(s):  
K. M. Lal ◽  
B. N. Khanna
Keyword(s):  
Emission Spectrum ◽  
Visible Region ◽  
Second Order ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Concave Grating

The emission spectrum of the A–X system of the PbBr molecule in the region 4 600–5 900 Å has been obtained in the second order of a 21-ft concave grating spectrograph (15 000 lines per inch) with a dispersion of 1.25 Å/mm. A rotational analysis of four bands—(3, 2), (2, 2), (3, 1), and (4, 1)—of this system has been done, leading to the determination of the following rotational constants:[Formula: see text]The system appears to be similar to the A-X system of the PbCl molecule in the visible region, and a [Formula: see text] transition has been suggested.

The b1Σ+–X3Σ− band system of SO

1968 ◽  
Vol 46 (13) ◽  
pp. 1539-1546 ◽  
Author(s):  
R. Colin
Keyword(s):  
High Resolution ◽  
Microwave Discharge ◽  
Band System ◽  
Rotational Constants

The 0–0, 1–1, 2–2, and 0–1 bands of the b1Σ+–X3Σ− transition of the SO molecule have been observed in the afterglow produced when COS + O2 is pumped rapidly through a microwave discharge. The two strongest bands, 0–0 and 1–1, which lie respectively at 9549.08 and 9626.13 Å, have been photographed at high resolution and have been analyzed. Using the known X3Σ− rotational constants, the vibrational and rotational constants of the 1Σ+ state (Tc = 10 509.97 cm−1) have been determined: ωc′ = 1067.66 cm−1, Bc′ = 0.70262 cm−1, and rc′ = 1.5005 Å. Rotational intensity distributions for 1Σ+–3Σ− transitions are discussed. The a1Δ state of SO is predicted to lie at T ~ 6350 cm−1.

ROTATIONAL ANALYSIS OF THE VISIBLE BAND SYSTEM OF THE BiF MOLECULE

1962 ◽  
Vol 40 (9) ◽  
pp. 1077-1084 ◽  
Author(s):  
T. A. Prasada Rao ◽  
P. Tiruvenganna Rao
Keyword(s):  
Band System ◽  
High Dispersion ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Visible Band ◽  
System A

A rotational analysis of five bands, (1,0), (0,0), (0,1), (0.2), and (0,3), of the visible band system A of BiF has been carried out by photographing the bands under high dispersion (1.25 Å/mm). The analysis has shown that the bands arise from a 0+(3Σ−)–0+(3Σ−) transition. The rotational constants for the upper and lower states of the system are obtained.

THE b1Σ+–X3Σ− BAND SYSTEM OF NF

1966 ◽  
Vol 44 (10) ◽  
pp. 2251-2258 ◽  
Author(s):  
A. E. Douglas ◽  
W. E. Jones
Keyword(s):  
Ground State ◽  
Band System ◽  
High Dispersion ◽  
Rotational Analysis ◽  
Strong Band

If argon mixed with a small amount of NF3 is pumped rapidly through a mild discharge, a green glow is observed downstream from the discharge. This emission has been photographed with a high dispersion spectrograph and found to consist of a strong band with a head at 5 288 Å and a number of weaker bands. A rotational analysis of the bands has shown that they are the b1Σ+–X3Σ− bands of the NF molecule. The constants of the two states have been determined and it is found that for the ground state, ωe = 1 141.37 cm−1 and re = 1.317 3 Å.

A 3Σ–3Π transition of the SiO molecule

1970 ◽  
Vol 48 (12) ◽  
pp. 1436-1440 ◽  
Author(s):  
S. Nagaraj ◽  
R. D. Verma
Keyword(s):  
Quartz Tube ◽  
High Dispersion ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Single Sequence

The spectrum in the region 4200–4300 Å, attributed to the SiO molecule, has been excited strongly in a r.f. discharge through a mixture of argon and a trace of SiCl4 vapor flowing through a quartz tube. The spectrum consists of a single sequence Δν = 0. The 0–0 and 1–1 bands have been photographed at high dispersion. A rotational analysis of these bands shows that they involve a 3Σ–3II transition and not a 1Σ–3Π transition as reported earlier. The following rotational constants were determined:[Formula: see text]

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