scholarly journals RYDBERG ABSORPTION SERIES OF N2

1962 ◽  
Vol 40 (11) ◽  
pp. 1593-1607 ◽  
Author(s):  
M. Ogawa ◽  
Y. Tanaka
Keyword(s):  
Absorption Spectrum ◽  
Electronic States ◽  
Grazing Incidence ◽  
The Other ◽  
Electronic Transitions ◽  
Electron Configuration ◽  
Rydberg Series ◽  
M 31

The absorption spectrum of N2 in the 600–1000 Å region, particularly the Rydberg series, has been reinvestigated with a grazing incidence spectrograph with a 6.8-meter concave grating.Worley–Jenkins' Rydberg series which converges to the [Formula: see text] state of [Formula: see text] was extended to m = 31. It is suggested that the doublet character of this series is due to the two electronic transitions whose upper states are 1Πu and [Formula: see text] given by the electron configurations:[Formula: see text]and[Formula: see text]respectively.Eight Rydberg series, including Worley's third series, were observed in the region between 710 and 950 Å. These series are divided into two groups, each consisting of four vibration series, ν′ = 0, 1, 2, and 3, with one converging to the A2Πu, 1/2 state and the other to the A2Πu, 3/2 state of [Formula: see text]. The upper electronic states of these two groups are assigned as 1Πu and 3Πu states given by the electron configuration:[Formula: see text]Hopfield's Rydberg series which converges to the [Formula: see text] state of [Formula: see text] was extended to m = 21, and in addition, one vibration series (ν′ = 1) was newly observed. The upper electronic states of the series are assigned as [Formula: see text] states, given by the configuration:[Formula: see text]Another absorption series, which is accompanied closely by the Hopfield emission series, was also observed and the upper electronic states of the series are assigned as [Formula: see text] states, given by the configuration:[Formula: see text]

ABSORPTION SPECTRUM OF THE NO MOLECULE: IV. THE G2Σ−–X2Π SYSTEM

1964 ◽  
Vol 42 (5) ◽  
pp. 848-859 ◽  
Author(s):  
A. Lofthus ◽  
E. Miescher
Keyword(s):  
Absorption Spectrum ◽  
Dissociation Energy ◽  
Band System ◽  
The Other ◽  
High Dispersion ◽  
Electron Configuration ◽  
The Many ◽  
No Absorption ◽  
Overlapping Bands

High-dispersion plates of the NO absorption spectrum have been studied between 1600 and 1390 Å for the three isotopic molecules N14O16, N15O16, and N14O18, and G2Σ−–X2Π bands were sorted out from the many overlapping bands in the spectrum. The well-defined band system satisfies the established isotope relations. In contrast with most of the other known NO band systems G2Σ−–X2Π shows almost no perturbations. Vibrational and rotational analyses gave the following constants for the G2Σ− state of N14O16: Te = 62911.7 cm−1; ωe = 1085.54 cm−1, ωexe = 11.083 cm−1, ωeye = −0.1439 cm−1, Be = 1.2523 cm−1, αe = 0.0204 cm−1, γe = 1.3426 Å. The combination defect observed in the G2Σ−–X2Π bands agrees with the defect found in the A2Σ+–X2Π(γ) bands except in sign, which is opposite. Therefore, the symmetry of the G state is confirmed as 2Σ−. The "pure precession" relation between G2Σ− and X2Π is found to hold for the Λ-type doubling of X2Π. The diffuse structure of the band assigned to ν = 10 indicates that G2Σ− is predissociated by a repulsive 2Σ− state dissociating into 2D(N)+3P(O) atoms at 71660 cm−1. The dissociation energy and electron configuration for G2Σ− are discussed.

RYDBERG ABSORPTION SERIES OF CO2 CONVERGING TO THE 2Πu STATE OF

1962 ◽  
Vol 40 (7) ◽  
pp. 879-886 ◽  
Author(s):  
Y. Tanaka ◽  
M. Ogawa
Keyword(s):  
Absorption Spectrum ◽  
Ionization Energy ◽  
Grazing Incidence ◽  
Ionization Potentials ◽  
Rydberg Series

The absorption spectrum of CO2 has been reinvestigated in the region 670–790 Å with a 6.8-meter grazing-incidence-type vacuum spectrograph. The Henning Rydberg series has been remeasured accurately along with its ν′ = 1 vibration series. In this manner, the ionization energy of the 2σu electron was determined to be 18.076 ev. Sixteen other Rydberg series were observed in this region. It was concluded that they are formed by the excitation of the 1πu electron. The ionization potentials corresponding to the energies of the 2Πu,3/2 and 2Πu,1/2 states of [Formula: see text] were found to be 17.312 ev and 17.323 ev respectively.

THE ABSORPTION SPECTRUM OF CNC

1966 ◽  
Vol 44 (2) ◽  
pp. 353-372 ◽  
Author(s):  
A. J. Merer ◽  
D. N. Travis
Keyword(s):  
Absorption Spectrum ◽  
Bond Length ◽  
Ground State ◽  
Flash Photolysis ◽  
Electronic States ◽  
Electronic Transitions ◽  
Ultraviolet Absorption Spectrum ◽  
Rotational Analysis ◽  
Bending Vibrations ◽  
Show Evidence

The ultraviolet absorption spectrum of the free CNC radical has been discovered in the flash photolysis of diazoacetonitrile, HC(CN)N2. The identity of the radical has been proved from isotopic evidence, using 15N and 13C, together with rotational analysis of the bands. Rotational analyses have shown that the bands of CNC must be assigned to two electronic transitions, A2Δu–X 2Πg, and [Formula: see text]. The sequence bands in the bending vibrations, which are observed in both electronic transitions, show evidence of Renner–Teller interaction in both the degenerate electronic states: this interaction is extremely large in the X2Πg state. The principal constants (in cm−1) of the observed states of CNC are as follows:[Formula: see text]The C—N bond length in the ground state of CNC is found to be 1.245 Å.CNC is isomeric with CCN, whose spectrum has been reported previously; some interesting comparisons are made between the spectra of these two molecules.

THE ABSORPTION SPECTRUM OF SH AND SD IN THE VACUUM ULTRAVIOLET

1966 ◽  
Vol 44 (10) ◽  
pp. 2447-2459 ◽  
Author(s):  
B. A. Morrow
Keyword(s):  
Absorption Spectrum ◽  
Excited State ◽  
Excited States ◽  
Ground State ◽  
Vacuum Ultraviolet ◽  
Flash Photolysis ◽  
Electronic States ◽  
Rydberg Series ◽  
A Value ◽  
Vibrational Constants

The absorption spectrum of SH in the vacuum ultraviolet has been obtained by the flash photolysis of hydrogen sulfide. Transitions from the 2Π ground state to seven excited states have been observed and four of these fit reasonably well into a Rydberg series. From an extrapolation to the convergence limit of this series, a value of 10.40 ± 0.03 eV for the ionization potential of SH has been derived. Values for the rotational constants of these new electronic states have been determined; corresponding data for SD have also been obtained. The (1–0) transition of the system near 1 670 Å (B2Σ–X2Π) was observed, and, with the aid of isotope relations, vibrational constants of the B state have been derived. An estimate of the dissociation energy of SH in this excited state is D0′ = 24 190 ± 1 000 cm−1.

scholarly journals The absorption spectrum of acetaldehyde in the vacuum ultra-violet

1946 ◽  
Vol 185 (1001) ◽  
pp. 176-182 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Ionization Potential ◽  
Ultra Violet ◽  
Polyatomic Molecules ◽  
Excited Electron ◽  
Electronic Transitions ◽  
Rydberg Series ◽  
Vacuum Ultra Violet

The absorption spectrum of acetaldehyde has been photographed in the vacuum ultra ­ violet. Three Rydberg series were found, all leading to the same limit. For the first of these no less than sixteen members were observed, enabling the ionization potential to be given as 10·1811 ±0·0007 V. This is the most extensive Rydberg series so far found in polyatomic molecules. The excited electron is one of the non-bonding 2 p y oxygen electrons. The nature of the electronic transitions responsible for the various regions of the spectrum is discussed.

The absorption spectrum of diatomic phosphorus between 1370 and 600 Å

1975 ◽  
Vol 342 (1628) ◽  
pp. 93-111 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Ionization Potential ◽  
Dissociation Energy ◽  
Ground State ◽  
Molecular Orbitals ◽  
The Other ◽  
Ultraviolet Absorption Spectrum ◽  
Rydberg Series ◽  
Far Ultraviolet ◽  
First Ionization Potential

Nine Rydberg series have been observed in the far ultraviolet absorption spectrum of P 2 . Four of these converge to the.(5σ g ) 2 (2π u ) 3 , 2II u (inv.) state of the ion which is established as being the ground state; four to the low-lying ...(5σ g ) (2π u ) 4 , A 2 Ʃ g + state and one to a newly identified (5σ g ) (2π u )3 2πg, F 2 Ʃ + u state. The first ionization potential is found to be 85 229 ± 15 cm-1 (10.567 ± 0.002eV), which is the limit corresponding to the upper component (2II1/2 ) of the inverted X 2II u state. The other limits are observed at 87 179 + 2cm -1 (A 2 Ʃ + g ) and 125 225 ± 10cm -1 (F 2 Ʃ + u ). The series have been interpreted in terms of molecular orbitals and are found to involve excitation of n sσ g , n dσ g , n dπ g and n dδ g for the X 2 II u core; n pπ u , n fσ u , and n fπ u for the A 2 Ʃ + g core and for the A 2 Ʃ + u core. The evaluation and identification of the series limits enables the relative positions of the states of P + 2 to be established. The dissociation energy of P + 2 is estimated to be 4.98 ± 0.01eV.

scholarly journals The spectrum of thallium chloride

1938 ◽  
Vol 166 (925) ◽  
pp. 238-249 ◽  
Keyword(s):  
The Other ◽  
Electronic Transitions ◽  
Sufficient Information ◽  
Thallium Chloride ◽  
Band Spectra ◽  
Vibrational Constants

The results of a study of the spectrum of thallium fluoride (TIF) which have already been published (Howell 1937) contained so many points of unusual interest that it was considered desirable to extend the investigation to the other halides of thallium. In particular it was hoped to acquire sufficient information concerning the electronic transitions in TICI to enable a comparison to be made of the electronic levels of this molecule with those of TIF. Furthermore, certain of the vibrational constants of TICI, as listed in such reference works as Jevons' "Report on Band Spectra" (1932) and Sponer’s "Molekülspektren" (1936) seemed so abnormal as to justify a re-examination of this spectrum.

scholarly journals The spectrum of thallium fluoride

1937 ◽  
Vol 160 (901) ◽  
pp. 242-253 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Kinetic Energy ◽  
The Other ◽  
Molecular Spectra ◽  
Absorption Tube ◽  
Saturated Vapour ◽  
Long Wave ◽  
Original Investigation ◽  
Wave Edge

This study of the thallium fluoride spectrum was undertaken as part of a detailed investigation into the molecular spectra of the series of heavy diatomic fluorides HgF, TlF, PbF and BiF. Whereas the spectra of PbF (Rochester 1936) and BiF (Howell 1936), of which analyses have already been published, contain no very unusual features the TlF spectrum is particularly rich in them, so that it has seemed desirable to extend the original investigation in order to include the other halides of thallium. The absorption spectrum of the fluoride has already been examined by Boizova and Butkow (1936), their findings being summarized below: 1— A continuum at 2200 A appears when the absorption tube is at a temperature of 155° C. Its long-wave edge moves towards the red with increase of temperature, being at 2700 for the unsaturated vapour and at 3400 for the saturated vapour when the temperature is 280° C. They attributed this continuum to the dissociation of Tl 2 F 2 . Tl 2 F 2 → 2TlF + kinetic energy.

Unusual spectral shifts in the prototropic reactions of 2,7-diaminofluorene

1987 ◽  
Vol 65 (9) ◽  
pp. 2013-2018 ◽  
Author(s):  
R. Manoharan ◽  
Sneh K. Dogra
Keyword(s):  
Absorption Spectrum ◽  
Aqueous Medium ◽  
Fluorescence Spectrum ◽  
Blue Shift ◽  
Proton Donor ◽  
Red Shift ◽  
The Other ◽  
Spectral Shifts ◽  
Other Hand

The red shift observed in the absorption spectrum of 2,7-diaminofluorene (DAF) in ether and acetonitrile is either due to the proton-donating capacity of the solute or due to its dispersive interactions with the solvent and a blue shift in methanol and water is due to the proton-accepting nature of DAF. DAF acts as a proton donor in S1 state in all solvents. The red shift in the fluorescence spectrum of the monocation of DAF relative to that of DAF is not because of the —NH2 group becoming more basic but because of the large solvent relaxating in aqueous medium. On the other hand, the monocation of DAF in cyclohexane follows the normal blue shift in the fluorescence spectrum. pKa values for the various prototropic reactions in S0 and S1 states are determined and discussed.

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