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 electronic spectrum of F2

1976 ◽  
Vol 54 (13) ◽  
pp. 1343-1359 ◽  
Author(s):  
E. A. Colbourn ◽  
M. Dagenais ◽  
A. E. Douglas ◽  
J. W. Raymonda
Keyword(s):  
Absorption Spectrum ◽  
Ground State ◽  
Band System ◽  
Rydberg States ◽  
Rotational Analysis ◽  
Interaction Energies ◽  
Rydberg Series ◽  
Rotational Constants ◽  
Vibrational Levels ◽  
Ionic States

The absorption spectrum of F2 in the 780–1020 Å range has been photographed at sufficient resolution to allow a rotational analysis of many bands. A large number of vibrational levels of three ionic states have been observed and their rotational constants determined. Many perturbations in the rotational structure caused by the interaction between the three states have been investigated and the interaction energies determined. The rotational and vibrational structures of a few Rydberg states have also been analyzed in detail but no Rydberg series have been identified. The difficulties in assigning the observed states are discussed. A 1Σu+ – X1Σg+ emission band system has been observed in the 1100 Å region. An analysis of the bands of this system has allowed us to determine the term values and rotational constants of all the vibrational levels of the ground state with ν ≤ 22. The dissociation energy, D0(F2), is found to be greater than 12 830 and is estimated to be 12 920 ± 50 cm−1.

scholarly journals The spectrum of rubidium hydride, RbH I. Analysis

1939 ◽  
Vol 173 (952) ◽  
pp. 28-37 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Electronic Transition ◽  
Rotational Constant ◽  
Rotational Structure ◽  
Rotational Analysis ◽  
The Many ◽  
Sodium And Potassium ◽  
Line Type ◽  
Overlapping Bands

The spectra of the diatomic hydrides of lithium, sodium and potassium have been studied both in absorption and in emission by several authors, LiH by Nakamura (1930, 1931) and Crawford and Jorgensen (1935), NaH by Hori (1930, 1931) and Olsson (1935), KH by Almy and Hause (1932) and Hori (1933), and recently Almy and Rassweiler (1938) have published details of the absorption spectrum of caesium hydride. All these hydrides show spectra of the “ many-line” type consisting of numerous overlapping bands with open rotational structure and no obvious heads. A rotational analysis shows that they all have the same type of electronic transition, 1Σ → 1Σ ,and are very strongly degraded towards the red. These spectra are all anomalous in that the frequency, ω´ v , and the rotational constant, B'v,increase at first with increasing initial vibrational quantum numbe v `.

High-resolution studies of the near-ultraviolet bands of oxygen: III: the system

1986 ◽  
Vol 64 (6) ◽  
pp. 726-732 ◽  
Author(s):  
B. Coquart ◽  
D. A. Ramsay
Keyword(s):  
High Resolution ◽  
Electron Configuration ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Rotational Constants ◽  
Near Ultraviolet ◽  
Path Lengths

Ten bands of the [Formula: see text] system of oxygen have been observed in absorption using longer path lengths than in the earlier work of Herzberg (1953). Rotational analysis of the bands confirms that the A′ 3Δu state is an inverted state as expected from electron-configuration arguments. Rotational assignments are given for the [Formula: see text] and [Formula: see text] sub-bands with ν′ = 2–11; weaker [Formula: see text] sub-bands are identified for ν′ = 5–11. Sub-band origins and rotational constants are given for all the bands. The following derived molecular constants are obtained:[Formula: see text]A comparison of the frequencies of the diffuse bands of oxygen with the sub-band origins of the [Formula: see text] bands shows convincingly that the diffuse bands can be assigned to a weak (O2)2 complex in which one of the O2 molecules is excited to the A′ 3Δu state.

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.

The lowest valence and Rydberg states in the dipole-allowed absorption spectrum of nitrogen. A survey of their interactions

1969 ◽  
Vol 47 (5) ◽  
pp. 547-561 ◽  
Author(s):  
Kurt Dressler
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Molecular Nitrogen ◽  
Rydberg States ◽  
Electronic States ◽  
Rotational Constants ◽  
Isotope Shifts ◽  
Valence States ◽  
Singlet States ◽  
Potential Curves

The ungerade singlet states of molecular nitrogen observed up to 115 000 cm−1 have traditionally been designated with some 20 letter symbols. It is shown that these levels do not belong to 20 different electronic states but that all of them can be ordered into six vibrational progressions of three valence states: b1Πu (j, b, d, m, p, q), b′ 1Σu+ (b′, g, g′, f, r), d′(1Σu− or 1Δu?), and of three Rydberg states: c1Πu (l, d″), c′ 1Σu+ (p′, r′, k, s′, h, h′), and o1Πu. The new assignments of observed levels to the states b, b′, c, and c′ are identical with those given by Carroll and Collins on the basis of new high-resolution studies of the absorption spectrum. It is shown here, that the irregularities of the vibrational intervals, rotational constants, isotope shifts, and intensity distributions within these progressions can be interpreted quantitatively on the basis of homogeneous interactions between valence and Rydberg states of the same species, especially between the pairs of states b1Πu + c1Πu and b′ 1Σu+ + c′ 1Σu+. Approximate quantitative deperturbations of the vibrational structures of these four electronic states are derived from a new set of deperturbation criteria, and the resultant potential curves, the electron configurations, and the observed predissociations are discussed. The deperturbation results for the b′ and c′ states are tested in more quantitative detail by Lefebvre-Brion in the adjoining paper.

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 Absorption Spectrum of Isotopic Diatomic Antimony ( 123Sb-123Sb). Analysis of the D ← X System in the 2860—2920 Å Region

1976 ◽  
Vol 31 (2) ◽  
pp. 145-157 ◽  
Author(s):  
Abdel Mooti Sibai ◽  
Ari Topouzkhanian ◽  
Pierre Perdigon
Keyword(s):  
Absorption Spectrum ◽  
Electronic State ◽  
Rotational Constant ◽  
Rotational Analysis ◽  
Vibrational Levels ◽  
X State

Abstract A rotational analysis of several bands of the D←X system of 123Sb−123Sb is carried out. It is shown that the hitherto assumed vibrational classification of the D←X system is certainly incorrect, as well as a previously given value for the rotational constant of the X state. B(X1∑g+, ν=0) is found equal to 0.044263 cm-1. The perturbations appearing in the various vibrational levels are interpreted in terms of interactions with a new electronic state, labelled L.

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.

NEW ELECTRONIC TRANSITIONS OF THE BH MOLECULE

1941 ◽  
Vol 19a (2) ◽  
pp. 27-31 ◽  
Author(s):  
A. E. Douglas
Keyword(s):  
Electronic Transitions ◽  
Lower State ◽  
Electron Configuration ◽  
Rotational Constants ◽  
Boron Trichloride ◽  
New States ◽  
Π State

In a discharge in helium with a trace of boron trichloride and hydrogen three new bands are found at 3415 Å, 3396 Å, and 3099 Å. Measurements of these bands show that they are due to two new electronic transitions of the BH molecule. The upper states of both transitions are previously unknown 1Σ+ states. The lower state of both transitions is the same and is a known 1Π state. The rotational constants of both new states have been determined and their electron configuration is suggested.

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