The Resonance Fluorescence and Absorption Spectrum of Nitrogen Dioxide

1973 ◽  
Vol 51 (20) ◽  
pp. 2184-2188 ◽  
Author(s):  
J. C. D. Brand ◽  
J. L. Hardwick ◽  
R. J. Pirkle ◽  
C. J. Seliskar
Keyword(s):  
Absorption Spectrum ◽  
Nitrogen Dioxide ◽  
Electronic Transition ◽  
Parallel Structure ◽  
Rotational Analysis ◽  
Resonance Fluorescence ◽  
Strong Resonance ◽  
Ion Laser

A krypton ion laser operating at 6470 Å excites strong resonance fluorescence in nitrogen dioxide gas. The fluorescence bands have "parallel" structure (ΔK = 0) and are assigned to the electronically allowed subsystem of a 2B2–2A1 electronic transition. A partial rotational analysis is given for the upper state of the fluorescence bands, and their relationship to the absorption spectrum in the region 6000–11 500 Å is discussed.

Absorption spectrum of SiH in the vacuum ultraviolet

1969 ◽  
Vol 47 (18) ◽  
pp. 1889-1897 ◽  
Author(s):  
G. Herzberg ◽  
A. Lagerqvist ◽  
B. J. McKenzie
Keyword(s):  
Absorption Spectrum ◽  
Electronic Transition ◽  
Vacuum Ultraviolet ◽  
Rotational Analysis ◽  
Molecular Constants

A new electronic transition of SiH has been observed in absorption near 1907 Å in flash discharges through mixtures of SiH4 and H2. The rotational analysis shows this transition to be of the type 2Σ+−2Π. The corresponding transition of SiD has also been observed and analyzed. The D2Δ−X2Π transition near 2058 Å which was observed and analyzed by Verma in SiD has been measured here for SiH, where the lines are much broader on account of predissociation. The predissociation phenomena in SiH and SiD and the electron configurations are briefly discussed, and the presently known molecular constants of these molecules are summarized.

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 `.

THE ABSORPTION SPECTRUM OF NO2 IN THE 3 700–4 600 Å REGION

1965 ◽  
Vol 43 (1) ◽  
pp. 74-81 ◽  
Author(s):  
A. E. Douglas ◽  
K. P. Huber
Keyword(s):  
Absorption Spectrum ◽  
Absorption Spectra ◽  
Electronic Transition ◽  
Rotational Analysis

An investigation of the absorption spectra of both 14NO2 and 15NO2 has revealed a long progression of red-degraded bands in the region 3 700–4 600 Å. The rotational analysis shows that these bands are the Ka = 0 ← 1 subbands of the electronic transition 2B1 ← 2A1. The interpretation of the bands is discussed, and a few remarks concerning the onset of predissociation at 3 979 Å are added.

The Resonance Fluorescence Spectrum of Sulfur Dioxide

1973 ◽  
Vol 51 (5) ◽  
pp. 530-536 ◽  
Author(s):  
J. C. D. Brand ◽  
D. R. Humphrey ◽  
A. E. Douglas ◽  
I. Zanon
Keyword(s):  
Sulfur Dioxide ◽  
Electronic State ◽  
Fluorescence Spectrum ◽  
Vibrational Analysis ◽  
Rotational Analysis ◽  
Resonance Fluorescence ◽  
Orbital Symmetry ◽  
Strong Resonance ◽  
Physical Evidence ◽  
Resonance Fluorescence Spectrum

The 2100 Å line of Zn+ excites strong resonance fluorescence in sulfur dioxide gas. Vibrational analysis shows that the fluorescence bands form progressions of about 5 members in ν1, ν2, and ν3, singly and in combination. Although the occurrence of transitions to odd- and even-numbered levels of ν3 without discernable alternation in intensity is unexplained, the widespread activity of ν3 provides strong physical evidence for an unsymmetrical (Cs) structure in the upper state of the transition. Rotational analysis indicates that the transition moment is parallel, or nearly parallel, to the a axis and therefore that the upper electronic state of these transitions has B2(A′) orbital symmetry.

The 2491 Å electronic transition of nitrogen dioxide I. Rotational analysis

1962 ◽  
Vol 266 (1325) ◽  
pp. 257-271 ◽  
Keyword(s):  
High Resolution ◽  
Nitrogen Dioxide ◽  
Ground State ◽  
Electronic Transition ◽  
Point Group ◽  
Rotational Analysis

The 2491 Å electronic transition of nitrogen dioxide has been photographed in absorption under high resolution and a rotational analysis of the (000) ← (000) band carried out. The analysis is consistent with the upper state belonging to the C 2v point group and having 2 B 2 electronic symmety with an N—O length of 1·314 Å and an ONO angle of 121°2'. The N—O length is considerably greater than the ground-state value of 1·197 Å and the ONO angle is somewhat less than the ground-state value of 134° 15'.

The 1650-1350 Å absorption spectrum of nitrogen dioxide

1962 ◽  
Vol 267 (1330) ◽  
pp. 395-407 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Nitrogen Dioxide ◽  
Ionization Potential ◽  
Ground State ◽  
Band System ◽  
Anharmonic Constant ◽  
Rydberg Transitions ◽  
First Ionization Potential

An analysis of the 1650-1350 Å band system of nitrogen dioxide has been carried out. A pattern of band spacings and intensities is found that is complex but regular. It is shown that this pattern is qualitatively, and to a large extent quantitatively, just what would be expected for a transition in which the shape of the molecule changes from bent to linear. The transition is a parallel one and the upper state has 2 Σ + u symmetry. The symmetrical stretching frequency is increased from its ground-state value to ca. 1420 cm -1 in the upper state. The upper-state bending frequency is ca. 600 cm -1 . The N — O length is decreased from its groundstate value, probably to 1·1(3) Å. The upper state resembles closely the ground state of NO + 2 . The transition is to be classed as one of the Rydberg transitions leading to the first ionization potential of NO 2 ; and the orbital to which the odd electron is transferred in the transition is (pσ) in type. The anharmonic constant g 22 for the linear upper state is found to be 2·(3) cm -1 . Other Rydberg transitions may well be present in the region, but have not been definitely identified.

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