Rotational absorption of some asymmetric rotor molecules

Gebbie, H. A.; Stone, Nick; Topping, Geoffrey J.; Gora, Edwin K.; Clough, S. A.; Kneizys, F. X.

doi:10.1016/0022-2852(66)90225-6

Cited by 29 publications

(2 citation statements)

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“…The position of the band origin of pure lB1 is still not certain, but it may be around 31 000 ~r n -l . ~~ The fluorescence excitation spectra observed with the 0.5 cm-' bandwidth laser could be simulated using a computer program for the rotational-structure analysis of an asymmetric-top molecule prepared by N a k a g a ~a , ~~ assuming the rotational constants of Hamada and Merer l 2 for the lA2 state and those of Gebbie et al 25 for the ground state. The rotational temperature could be defined so as to give the best fit between the observed and the calculated contours.…”

Section: Resultsmentioning

confidence: 99%

Rotation-dependent intramolecular processes of SO₂(Ã¹A₂) in a supersonic jet

Watanabe¹,

Tsuchiya²,

Koda³

1983

Faraday Discuss. Chem. Soc.

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Rotationally cooled SOr is prepared through supersonic expansion of its seeded mixture in Ar and is excited to the first electronically allowed state by a frequency-doubled dye laser pulse in the wavelength range of 300-320 nm, in particular, in " E " and " G " bands region, using Clements' notation. In the time-resolved fluorescence measurements with a 0.02 cm-I excitation bandwidth, all of the rovibronic levels examined exhibit apparent biexponential decay having a short lifetime of 3-5 ps and a long one of 15-30 ps. With application of a weak magnetic field (<50 G) some rovibronic lines show a beating fluorescence decay dependent on the field strength. The beating phenomenon has been analysed based on the classical theory of Zeeman quantum beats. The derived g-values distribute rather irregularly over a wide range, which indicates a complicated coupling among the relevant electronic states. At present the coupling mechanism which causes a sizeable magnetic moment seems to be quite independent of the coupling mechanism which results in the observed apparent biexponential decay. SUMMARY(1) The fluorescence originating from each rovibronic level of S 0 2 ( 2 'A2) in the " E " or " G " band excitation under zero magnetic field exhibits biexponential decay having a short lifetime of 3-5 ps and a long one of 15-30 ps.(2) Application of a magnetic field ((50 G) causes an oscillating fluorescence decay, its frequency being dependent on the transition as well as the magnetic field strength. This phenomenon is attributed to the Zeeman quantum beat and thus several rovibronic levels of SO,(^ ' A ~) possess a sizable g, value ranging from 0.14 to 0.002.(3) The magnetic moments are induced by coupling through the Renner-Teller effect and/or spin-orbit interaction to other relevant electronic states. The observed dependence of g,-values on rovibronic quantum numbers suggests that both of the above coupling mechanisms are operating.

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Section: Resultsmentioning

confidence: 99%