Rotational Absorption Spectrum of OCS

Strandberg, M. W. P.; Wentink, Tunis; Kyhl, R. L.

doi:10.1103/physrev.75.270

Cited by 38 publications

(7 citation statements)

References 16 publications

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“…It was observed that the splitting between the e and f sub-states increases with increasing J value and subsequently the l-type doubling constant was calculated. The variation of J 2 n D ( ) / with (J+1) is shown in figure 3 and the slope of the straight line provides the l-type doubling constant [22,23]. In our present study, the l-type doubling constant for (14 2 0) vibrational state was found to be (2.41±0.3)×10 −5 cm −1 which is ∼10 times smaller than the value of the l-type doubling constant for l=1 state of OCS.…”

Section: Resultsmentioning

confidence: 99%

Cavity ring-down spectroscopy measurements ofl-type doubling of hot bands in Δ vibrational states of OCS near 5.2μm

et al. 2018

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We investigated the l-type doubling in the (14 2 0)←(02 2 0) weak hot band transition of carbonyl sulphide (OCS) for l=2 (i.e. Δ state) vibrational state. High-resolution spectroscopic measurements of l-doublet splittings of OCS were carried out using cavity ring-down spectroscopy (CRDS) technique employing a continuous-wave (cw) external-cavity quantum cascade laser (EC-QCL) operating at ∼5.2 μm. The rotationally resolved spectra of l-doublet splittings between the parity doublet e and f sub-states of OCS were recorded by probing the rotational lines from J=22 to J=29 in the R branch belonging to the weak hot band transition. Subsequently, we determined the l-type doubling constant, transition dipole moment, rotational constant and centrifugal distortion constant for both e and f components of the (14 2 0) vibrational state with relatively high rotational states of OCS. As the measurement of l-doublet splitting in l=2 or higher states of OCS remains challenging due to extremely small splitting, therefore our findings suggest that the observation of the l-type doubling in Δ vibrational state (l=2) with new values of the several spectroscopic parameters as mentioned above will be useful for better understanding of linear polyatomic molecular properties in general from high-resolution spectroscopic data.

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Section: Resultsmentioning

confidence: 99%

Cavity ring-down spectroscopy measurements ofl-type doubling of hot bands in Δ vibrational states of OCS near 5.2μm

et al. 2018

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“…The experimental work was carried out with a standard Stark-modulated spectrograph that has been described elsewhere (6). A K-band klystron output was frequency doubled with a crystal doubler to the required range because of the lack of a frequency source in the region of this transition (48,000 Me/sec).…”

Section: Methyl Alcoholmentioning

confidence: 99%

Vibration-internal rotation interactions in molecules containing a symmetric top group

Swan

Strandberg

1957

Journal of Molecular Spectroscopy

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The vibration-internal rotation interactions in molecules that contain a single symmetric top are studied by means of a model consisting of two internally rigid groups that are allowed to vibrate as well as rotate relative to each other. The matrix mechanical Hamiltonian for the model is obtained and the diagonalization of the corresponding secular determinant that contains large off-diagonal terms is accomplished.,An expression for the J = 0 -s 1, AK = 0 transition is obtained. Numerical calculations are carried out for the case of methyl alcohol in order to compare the theory with the observed spectrum. A qualitative fit is found, the major contributions being the in-plane vibrations of the two rigid groups. The lack of detailed agreement is attributed to the neglect of those vibrations which distort the methyl group, and to insufficient knowledge concerning the infrared spectrum of the molecule.

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“…In Ref. 1 we have shown that a ratio of vibrational moments of inertia is exact to zero order, and experience with OCS has shown that in fact such a ratio is good to better than .1 per cent. For the present we car say no more until the change of M 3 with selenium mass is determined.…”

Section: Se80mentioning

confidence: 99%

“…5 The sweep spectroscope and frequency standard described in Ref. 1 were used in measuring the absorption frequencies. The signal generators for the J = 2-*3 were reflex klystrons; for the J = 5-6 and the J = 6-*7 absorption transitions were measured with the second harmonic porer generated in silicon crystals driven by standard klystrons.…”

Section: Eerimentalmentioning

confidence: 99%

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The Microwave Spectrum of Carbonyl Selenide

1949

Self Cite

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The microwave absorption spectrum of carbonyl selenide, OCSe, is reported. The expected linear structure is confirmed. The spectrum includes absorptions due to various isotopic forms of the molecule in the zero-point vibrational state and the first excited symmetrical stretching and. bending vibrational states. From these data vibration-rotation interaction coefficients, mass differences and approximate interatomic distances have been determined. Values for the nuclear spins of the ix stable selenium isotopes are suggested. Observations of the Stark effect lead to a determination of the dipole moment of the molecule in several vibrational states. Intensity measurements are used to determine vibrational frequencies and relative isotopic abundance.

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Rotational Absorption Spectrum of OCS

Cited by 38 publications

References 16 publications

Cavity ring-down spectroscopy measurements ofl-type doubling of hot bands in Δ vibrational states of OCS near 5.2μm

Cavity ring-down spectroscopy measurements ofl-type doubling of hot bands in Δ vibrational states of OCS near 5.2μm

Vibration-internal rotation interactions in molecules containing a symmetric top group

The Microwave Spectrum of Carbonyl Selenide

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