REFRACTION SPECTRUM OF GASES IN THE INFRARED INTENSITIES AND WIDTHS OF LINES IN THE 2–0 BAND OF HCl

1962 ◽  
Vol 40 (1) ◽  
pp. 113-121 ◽  
Author(s):  
J. H. Jaffe ◽  
S. Kimel ◽  
M. A. Hirshfeld
Keyword(s):  
Absorption Spectrum ◽  
Resolving Power ◽  
Band Intensity ◽  
Instrumental Effects ◽  
Infrared Intensities ◽  
Vibration Rotation ◽  
Rotation Constant

Intensities and widths of lines in the 2–0 band of HCl have been determined from the refraction spectrum. A hollow prism refractometer was used together with a monochromator of high resolving power. Fairly elaborate corrections for instrumental effects were applied to the observations. A band intensity of 3.68 cm−2 atm−1 was obtained. The vibration–rotation constant θ was found to be 0.97. Both these values agree well with recent results for HCl obtained from the absorption spectrum.

Vibration-rotation bands of allene

1949 ◽  
Vol 200 (1060) ◽  
pp. 1-9 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Geometrical Structure ◽  
Rotational Structure ◽  
Resolving Power ◽  
Vibrational Absorption ◽  
Grating Spectrometer ◽  
Fundamental Frequencies ◽  
Coriolis Perturbation ◽  
Vibration Rotation

The vibrational absorption spectrum of allene has been reinvestigated using a new grating spectrometer of high resolving power. The rotational structure of many of the bands has been measured and discussed in relation to the geometrical structure of the molecule. The perpendicular-type bands associated with absorption of the fundamental frequencies of degenerate oscillations show features of particular interest. Two of these bands provide an elegant example of a type of Coriolis perturbation originally predicated by Nielsen, and which results in an unusual arrangement of the Q branches in each band.

Vibration-rotation bands of methane

1952 ◽  
Vol 213 (1112) ◽  
pp. 42-54 ◽  
Keyword(s):  
Complex System ◽  
Absorption Spectrum ◽  
Fine Structure ◽  
Resolving Power ◽  
Absorption Bands ◽  
Infra Red ◽  
Vibration Rotation

The infra-red absorption spectrum of methane 12 CH 4 in the region of 3 μ has been re-investigated with higher resolving power than has been used previously. A very complex system of overlapping vibration bands has been revealed. The rotational fine structure of these bands has been partially analyzed, particularly having regard to the Coriolis interactions which occur in this case. The corresponding absorption bands of 13 CH 4 have also been examined.

The fundamental vibration-rotation band of hydrogen chloride

1953 ◽  
Vol 218 (1132) ◽  
pp. 29-36 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Absorption Band ◽  
Hydrogen Chloride ◽  
Resolving Power ◽  
Fundamental Vibration ◽  
Bond Lengths ◽  
Isotopic Species ◽  
The Difference ◽  
Vibration Rotation ◽  
Derived Data

The fundamental vibration-rotational absorption band of hydrogen chloride near 3·45 μ has been remeasured using higher resolving power than previously. The wave-lengths of the absorption lines have been determined more precisely, and the isotopic splitting of lines has been completely resolved. The results have provided new and more satisfactory values for the rotational constants B i , and the centrifugal stretching constants D i , and their relative values for the two isotopic species agree closely with what is to be expected for the difference in mass. The positions of the lines in the pure rotational absorption spectrum have been calculated from the derived data, and agree closely with those recently observed. The bond lengths r 0 for each isotopic species H 35 CI and H 37 CI is found to be 1·274 4 Å.

Vibration-rotation bands and rotational constants of dideuteroacetylene

1955 ◽  
Vol 232 (1190) ◽  
pp. 291-309 ◽  
Keyword(s):  
Resolving Power ◽  
Vibrational States ◽  
Absorption Bands ◽  
Rotational Constants ◽  
Vibrational Assignments ◽  
Vibrational Anharmonicity ◽  
A Value ◽  
Vibrational Levels ◽  
Vibration Rotation ◽  
Very High

Nine vibrational absorption bands of dideutero-acetylene have been examined with very high resolving power. The rotational constants have been determined for the vibrational levels concerned, and the coefficients α i have been determined with more convincing accuracy than previously. In some of the bands the Q branches have been resolved, so that the l -doubling coefficients q i could be derived, and details could be established about the doublet components in some II levels. The results emphasize the need of high resolution if the vibrational assignments are to be unambiguous, and if reliable values of the rotational constants are to be derived. A value of B e has been obtained, and the vibrational anharmonicity coefficients have been considered briefly. Estimates of the centrifugal stretching constants D i in different vibrational states have been made, and one anomalous case has been found.

High-resolution spectroscopy of minor atmospheric constituents

1956 ◽  
Vol 236 (1205) ◽  
pp. 159-160
Keyword(s):  
Absorption Spectrum ◽  
Vibrational Frequency ◽  
Solar Spectrum ◽  
Resolving Power ◽  
High Resolution Spectroscopy ◽  
Survey Article ◽  
Royal Observatory ◽  
Infra Red ◽  
Scientific Station ◽  
The University

In a recent survey article, Goldberg (1954) gives a list of 127 molecular bands which have been observed in the absorption spectrum of the earth’s atmosphere by studying the solar spectrum between 0.3 and 24 μ . Among these, 35 bands are attributed to the following molecules: O 3 , N 2 O, CH 4 , HDO, CO. The main purpose of this contribution to the Discussion was to show several of these bands as they appear on solar spectrograms taken at the International Scientific Station, Jungfraujoch (Switzerland), in collaboration with Dr L. Neven of the Royal Observatory, Uccle (Belgium). The altitude of this station is 3580 m. It has been pointed out in earlier notes (Migeotte & Neven 1952 a, b ) that these data have been obtained, under high resolving power, by using the prism-grating infra-red spectrograph of the University of Liege (Migeotte 1945). Between 9.33 and 10.08 μ , our spectrograms show 320 lines which are mainly due to the fine structure of the 9.6 μ band of ozone (Migeotte, Neven & Vigroux 1952). Part of our data has been analyzed recently by Kaplan (1955), of the Institute for Advanced Study in Princeton (N. J.), U. S. A. A good fit for low J has been obtained with the following upper-state parameters: vibrational frequency v 3 1042.16 cm -1 ; rotational constants: A = 3.502 1 cm -1 , B = 0.440 1 cm -1 , C = 0.388 3 Cm -1 ; δ = 0.0166 34 .

Etude des intensités et des largeurs des raies de vibration–rotation de la bande deuxième harmonique de l'anhydride carbonique à 6970 cm−1 par déconvolution numérique

1968 ◽  
Vol 46 (15) ◽  
pp. 1697-1703 ◽  
Author(s):  
Philippe Arcas ◽  
Lucette Hochard-Demolliere
Keyword(s):  
Line Width ◽  
Half Width ◽  
Numerical Calculations ◽  
Instrumental Effects ◽  
Curve Versus ◽  
Variation Curve ◽  
Vibration Rotation

The intensity and half-width of the 12CO2 3ν3 band lines are determined, the instrumental effects being corrected by numerical calculations. The square of the vibrational moment (R03)2 is found to be equal to 0.233 × 10−42 e.s.u. With a quadrupolar momentum Q = 5.2 × 10−26 e.s.u., the line-width variation curve versus J can be approximately interpreted by Anderson's theory.

The absorption spectrum of gaseous hydrogen bromide in the schumann region I. Rotational analysis

1961 ◽  
Vol 263 (1313) ◽  
pp. 259-276 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Hydrogen Bromide ◽  
Electronic States ◽  
Gaseous Hydrogen ◽  
Rotational Structure ◽  
Resolving Power ◽  
Rotational Analysis ◽  
Region I

The absorption spectrum of gaseous hydrogen bromide has been photographed in the region 1180 to 1500 Å, using fourth and fifth orders of a 3 m grating. About forty bands have been observed. The resolving power sufficed for the study of most of the discrete rotational structure. The analysis reveals that few of the bands are related in vibrational progressions and shows rather that they are to be associated with atleast thirty new electronic states.

Vibration-rotation bands of nitrous oxide

1951 ◽  
Vol 208 (1094) ◽  
pp. 326-331 ◽  
Keyword(s):  
Nitrous Oxide ◽  
Fine Structure ◽  
Ground State ◽  
Wave Length ◽  
The Other ◽  
Resolving Power ◽  
Microwave Measurements ◽  
Rotational Constants ◽  
Infra Red ◽  
Vibration Rotation

The infra-red absorption of nitrous oxide gas near 4·5 μ has been re-investigated using high resolving power. The rotational fine structure has been split up and shown to involve two vibrational transitions, one due to absorption of a fundamental from the ground state, and the other to a π → π transition from an excited vibrational level. The transitions have been analyzed theoretically and rotational constants obtained. The results serve to emphasize the importance of using more precise wave-length standards for infra-red measurements than have been used hitherto, if the rotational constants are to be obtained with accuracy com­parable to that achieved by microwave measurements. Excellent agreement with the latter has now been found.

Absorption spectrum in the vacuum ultraviolet and visible emission spectrum of the NO molecule. The 4d complex

1969 ◽  
Vol 47 (8) ◽  
pp. 881-891 ◽  
Author(s):  
R. Suter
Keyword(s):  
Nitric Oxide ◽  
Absorption Spectrum ◽  
Emission Spectrum ◽  
Vacuum Ultraviolet ◽  
Visible Emission ◽  
Resolving Power ◽  
Weak Band ◽  
Oxide Molecule ◽  
Rydberg Electron

The structure of the 4d Rydberg term complex of the nitric oxide molecule has been studied by rotational analyses of the following bands photographed with spectrographs of high resolving power: (i) the weak band 4d–X2Π observed at 1470 Å in the absorption spectrum, (ii) the group 4d–3p of Rydberg–Rydberg bands observed as 4d–C2Π (6400 Å) and 4d–D2Σ+ (6800 Å) bands in the emission spectrum of a discharge. A type of l uncoupling of the Rydberg electron of the molecule is found very similar to the case already known for the 3d complex of NO. Constants characterizing the d complexes are calculated, and a comparison of the 3d and 4d complex is made.

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