Absorption spectra of O2 in the a1Δg, , and states

1968 ◽  
Vol 46 (5) ◽  
pp. 337-342 ◽  
Author(s):  
F. Alberti ◽  
R. A. Ashby ◽  
A. E. Douglas
Keyword(s):  
Absorption Spectra ◽  
Ground State ◽  
Vacuum Ultraviolet ◽  
Electronic States ◽  
Ultraviolet Spectrum ◽  
Absorption Bands

A number of new absorption bands have been found in the vacuum ultraviolet spectrum of O2 that has been excited by a discharge. The lower states of these bands are the [Formula: see text] and a1Δg states. The analysis of the bands, together with some newly analyzed bands arising from ground-state O2, has allowed us to identify four new electronic states. It has not been possible to assign these states to particular electron configurations of O2.

The infrared and ultraviolet absorption spectra of diimide (N2H2)

1968 ◽  
Vol 46 (8) ◽  
pp. 1005-1011 ◽  
Author(s):  
A. Trombetti
Keyword(s):  
Infrared Spectrum ◽  
Absorption Spectra ◽  
Ground State ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Spectrum ◽  
Ultraviolet Absorption ◽  
Electronic Ground State ◽  
Trans Conformation ◽  
Ultraviolet Spectra ◽  
Electronic Ground

The infrared spectrum of N2H2 in the 3.1 μ region and the ultraviolet spectra of N2H2 and N2D2 have been examined. The analysis of the infrared spectrum indicates that N2H2 in the ground state has a planar trans-conformation with with rN−N = 1.238 ± 0.007 Å and [Formula: see text], assuming rN−H to be between 1.05 and 1.08 Å. In the vacuum ultraviolet spectrum near 1700 Å, progressions of bands with spacings of 1180 and 950 cm−1 have been observed for N2H2 and N2D2, respectively. From the intensity alternation in the J structure of the vacuum ultraviolet spectrum it seems to follow that the electronic ground state of N2H2 is not totally symmetric.

A Discussion on astronomy in the ultraviolet - A study of interstellar lines in the rocket spectrum of δ Scorpii

1975 ◽  
Vol 279 (1289) ◽  
pp. 317-322
Keyword(s):  
Ground State ◽  
Atomic Hydrogen ◽  
Vacuum Ultraviolet ◽  
Velocity Dispersion ◽  
Ultraviolet Spectrum ◽  
Ultraviolet A ◽  
Average Ratio ◽  
Solar Abundances ◽  
Fe Ions ◽  
Cloud Density

An analysis is made of ten interstellar lines in the vacuum ultraviolet spectrum of 8 Sco. The data were taken from a rocket spectrogram with wavelength coverage extending from 1177 to 1717 A with a resolution of approximately 0.15 A. Column densities of C°, C+, N°, 0°, A1+, Si+ and Fe+ are derived, from which abundances relative to atomic hydrogen are determined. Compared to corresponding solar abundances, silicon and iron are slightly overabundant whereas the remaining species are underabundant by factors of 1.8 to 8.6. It is shown that the relative Fe abundance may be made significantly less than the solar value by arbitrarily increasing the velocity dispersion of the Fe+ ions by a factor of 2. The relative populations of the carbon atoms ground state fine structure levels combined with two possible mean cloud temperatures of 47 and 76 K determined from the interstellar H 2 spectrum yield a mean cloud density of 250 and 150 cm-3 respectively. Using the appropriate column densities of neutral and singly ionized carbon atoms, the average ratio of the electron density at the hydrogen atom density for each temperature is found to be 2.1 x 10-4 and 4.8 x 10~2 *4 respectively.

Experimental evidence for trapped exciton states in liquid rare gases

1970 ◽  
Vol 317 (1528) ◽  
pp. 113-131 ◽  
Keyword(s):  
Experimental Evidence ◽  
Absorption Spectra ◽  
Disordered Systems ◽  
Vacuum Ultraviolet ◽  
Solid Phase ◽  
Liquid System ◽  
Rare Gases ◽  
Line Broadening ◽  
Absorption Bands ◽  
Additional Line

In connexion with studies of the electronic structure of disordered systems, we enquire whether there exist exciton states in simple liquids. We report the results of a vacuum ultraviolet spectroscopic study of liquid argon and of liquid krypton doped with xenon. Experimental evidence was obtained for Wannier-Mott type impurity states in liquids which have no parentage in the excited states of the isolated atoms constituting the dense fluid. The absorption spectra of the doped liquid rare gases were monitored in the region 160 to 120 nm. The following experimental results are reported: (a) In the Xe/Ar liquid two absorption bands corresponding to the 1 S 0 → 3 P 1 and to the 1 S 0 → 1 P 1 transitions (or alternatively to the n = 1 Wannier states) were identified at 141 nm (8.80eV)† and at 123nm (10.1 eV). An additional line was observed at 127 nm (9.76eV). (b) In the Xe/Kr liquid three absorption bands were observed at 144.5 nm (8.59 eV), 125.5 nm (9.89 eV) and 129 nm (9.6 eV). (c) The absorption spectra of the doped liquids were compared with the spectra of 1 cm thick doped solid rare-gas crystals. From these results we conclude that: (a) The 127 nm (9.76 eV) band in the Xe/Ar liquid system and the 129 nm (9.61 eV) band in the Xe/Kr liquid system cannot be attributed to a perturbed ‘atomic’ state and are assigned to the n = 2 Wannier state in the liquid. (b) Line broadening of exciton states in the liquid can be accounted for by a simple scattering model. (c) Preliminary information on band gaps in liquid rare gases were obtained from the spectroscopic data. (d) The effect of liquid-solid phase transition on the line broadening of exciton states is consistent with electron mobility data in these systems.

The A2Πi–X2Πi absorption spectrum of BrO

1981 ◽  
Vol 59 (12) ◽  
pp. 1908-1916 ◽  
Author(s):  
M. Barnett ◽  
E. A. Cohen ◽  
D. A. Ramsay
Keyword(s):  
Absorption Spectrum ◽  
Absorption Spectra ◽  
Ground State ◽  
Flash Photolysis ◽  
Absorption Bands ◽  
Long Wavelength ◽  
Numbering Scheme ◽  
Ozonized Oxygen ◽  
Good Agreement

Absorption spectra of isotopically enriched 81Br16O and of normal BrO have been obtained by the flash photolysis of mixtures of bromine and ozonized oxygen. Rotational analyses are given for the 7–0, 12–0, 18–0, 19–0, 20–0, 21–0, 7–1, and 20–1 A2Π3/2–X2Π3/2 sub-bands of 81Br16O. The value for [Formula: see text] is found to be 722.1 ± 1.1 cm−1 in good agreement with the value calculated from microwave constants. Several additional bands have been found at the long wavelength end of the spectrum, necessitating a revision of the vibrational numbering scheme for both the emission and absorption bands. "Hot" bands up to ν″ = 6 have been observed in the absorption spectrum for the 2Π3/2 component of the ground state but no bands have yet been identified from the 2Π1/2 component.

The absorption spectrum of liquid bromine

1937 ◽  
Vol 162 (910) ◽  
pp. 414-419 ◽  
Author(s):  
D. Porret ◽  
Frederick George Donnan
Keyword(s):  
Absorption Spectrum ◽  
Absorption Spectra ◽  
Ground State ◽  
Wave Length ◽  
Electronic States ◽  
Excited Electronic States ◽  
Long Wave ◽  
Liquid Bromine ◽  
Continuous Absorption ◽  
The Continuum

The continuous absorption spectra of gaseous bromine (Peskow 1917; Ribaud 1919; Gray and Style 1929; Acton, Aikin and Bayliss 1936) and of dissolved bromine (Bovis 1929; Gillam and Morton 1929) have been studied many times. They present a wide continuum (from about 30, 000 to 17, 000 cm. -1 .) with a maximum at 24, 000 cm. -1 . For the gas the continuum is preceded by two band systems on the long wave-length side. These systems converge at 19, 585 and 15, 896 cm. -1 . respectively. Acton, Aikin and Bayliss (1936) have shown that the continuum is not simple, and Mulliken (1936) and Darbyshire (1937) have pointed out that there are three overlapping continua corresponding to transitions from the ground state to three different excited electronic states. There are 3 II 0 + ← 1 Σ g , 3 II 1 ← 1 Σ g and 1 II ← 1 Σ g . The absorption spectrum of liquid bromine has been studied by Bovis (1929) form 18, 525 to 31, 750c cm. -1 . and by Camichel (1893) for two frequencies only (16, 978 and 18, 691 cm. -1 ).

Absorption Spectra of Ground-State and Low-Lying Electronic States of Copper Nitrosyl: A Rare Gas Matrix Isolation Study

2005 ◽  
Vol 109 (45) ◽  
pp. 10264-10272 ◽  
Author(s):  
Lahouari Krim ◽  
Xuefeng Wang ◽  
Laurent Manceron ◽  
Lester Andrews
Keyword(s):  
Absorption Spectra ◽  
Ground State ◽  
Matrix Isolation ◽  
Electronic States ◽  
Rare Gas

THE ULTRAVIOLET ABSORPTION SPECTRA OF ALIPHATIC NITRAMINES, NITROSAMINES, AND NITRATES

1949 ◽  
Vol 27b (11) ◽  
pp. 828-860 ◽  
Author(s):  
R. Norman Jones ◽  
G. Denis Thorn
Keyword(s):  
Absorption Spectrum ◽  
Absorption Spectra ◽  
Ultraviolet Spectrum ◽  
Ultraviolet Absorption ◽  
Absorption Bands ◽  
Structure Formula ◽  
New Compounds

The ultraviolet absorption bands associated with the following groups have been investigated in a variety of compounds of known structure:[Formula: see text]The groups may be characterized by the ultraviolet spectrum, and the number of each type of group present in a given compound may be estimated from an analysis of the shape and intensity of the absorption spectrum. These correlations have been applied to the elucidation of the structure of new compounds isolated in the course of the investigation of the chemistry of 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX).

The photoabsorption of chlorodifluoroethenes in the vacuum ultraviolet

1985 ◽  
Vol 63 (7) ◽  
pp. 1949-1954 ◽  
Author(s):  
Eckart Rühl ◽  
Hans-Werner Jochims ◽  
Helmut Baumgärtel
Keyword(s):  
Energy Range ◽  
Ionization Potential ◽  
Gas Phase ◽  
Absorption Spectra ◽  
Photon Energy ◽  
Vacuum Ultraviolet ◽  
Rydberg Series ◽  
Absorption Bands ◽  
Broad Absorption ◽  
Cis And Trans

The gas phase absorption spectra of 2-chloro-1,1-difluoroethene, cis- and trans-1-chloro-1,2-difluoroethene have been measured in the photon energy range from 6.5 to 25 eV. The π → π* transition is assigned to bands centered around 7.17 – 7.20 eV for all three isomers. Four Rydberg series are observed in all the spectra, converging to the π ionization potential: two np-type Rydberg series, one ns, and one nd series are assigned. The convergence limits are: 9.84 eV (2-chloro-1,1-difluoroethene), 9.86 eV (trans-1-chloro-1,2-difluoroethene), and 9.85 eV (trans-1-chloro-1,2-difluoroethene). In the case of 2-chloro-1,1-difluoroethene four additional Rydberg series are found converging to the nCl ionization potential. The convergence limit of these series is 12.15 eV.Above 12 eV broad absorption bands dominate the spectra.

ISOTOPE SHIFT OF THE NITROGEN ABSORPTION BANDS IN THE VACUUM ULTRAVIOLET REGION

1964 ◽  
Vol 42 (9) ◽  
pp. 1716-1729 ◽  
Author(s):  
M. Ogawa ◽  
Y. Tanaka ◽  
A. S. Jursa
Keyword(s):  
Isotope Shift ◽  
Vacuum Ultraviolet ◽  
Electronic States ◽  
Normal Incidence ◽  
Ultraviolet Region ◽  
Nitrogen Absorption ◽  
Absorption Bands ◽  
Quantum Numbers ◽  
Vibrational Levels ◽  
Vacuum Ultraviolet Region

The vibrational isotope shift of the nitrogen absorption bands has been studied in the 830–1000 Å region. A 3-meter normal-incidence vacuum spectrograph was used with the helium continuum as background.According to our analysis, the vibrational quantum numbers assigned to the lowest observed vibrational levels for the various electronic states of N214 are as follows: [Formula: see text], 100 824 cm−1, ν = 0; (b 1Πu), 101 455 cm−1, ν = 1; (l 1Πu), 104 146 cm−1, ν = 5; [Formula: see text], 104 366 cm−1, ν = 0; (m 1Πu), 105 350 cm−1, ν = 5 ~ 7; (o 1Πu), 105 703 cm−1, ν = 0; [Formula: see text], 106 649 cm−1, ν = 4; (p 1Πu), 108 373 cm−1, ν = 9 ~ 10; [Formula: see text], 109 833 cm−1, ν = 11 ~ 12; [Formula: see text] 110 944 cm−1, ν = 10; (s ?), 116 688 cm−1, ν > 20; and (t ?), 118 486 cm−1,[Formula: see text]. The observed isotope shift for the bands [Formula: see text], 106 381 cm−1; [Formula: see text], 108 549 cm−1; (f ?), 110 196 cm−1; [Formula: see text] 110 664 cm−1; [Formula: see text], 112 777 cm−1; (h′ ?), 114 841 cm−1; (h″ ?), 116 820 cm−1; and [Formula: see text], 118 778 cm−1 increases in this order and shows that none of these bands corresponds to a (0, 0) band.

Forbidden absorption bands of O2 in the argon continuum region

1969 ◽  
Vol 47 (17) ◽  
pp. 1805-1811 ◽  
Author(s):  
M. Ogawa ◽  
K. R. Yamawaki
Keyword(s):  
Absorption Spectrum ◽  
Ground State ◽  
Electronic States ◽  
Absorption Bands ◽  
Rotational Constants ◽  
Continuum Region

The absorption spectrum of O2 has been photographed in the argon continuum region with a 3-m vacuum spectrograph at a dispersion of 1.42 Å/mm. Based on the known rotational constants of the ground state, the rotational constants of the upper states have been determined for Tanaka progession (I), β–X3Σg−, progression (II), α1Σu+–X3Σ−, and those of a new band at 1144.6 Å. In a brief discussion of the upper electronic states, it is suggested that both the β state and the upper states of the 1144.6 Å band are 3Σu+ states and their electron configurations are (πg2p)(3pπ) and (πg2p)(4pπ), respectively, and also the α state is (πg2p)(3pπ)1Σu+.

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