Study of the v1,v3 bands of 120SnH4: Part I--diode laser spectroscopy

V. M. Krivtsun; D. A. Sadovskii; E. P. Snegirev

doi:10.1117/12.58667

1 April 1992 Study of the v1,v3 bands of ¹²⁰SnH₄: Part I--diode laser spectroscopy

V. M. Krivtsun, D. A. Sadovskii, E. P. Snegirev

Proceedings Volume 1724, Tunable Diode Laser Applications; (1992) https://doi.org/10.1117/12.58667
Event: Tunable Diode Laser Applications, 1993, Moscow, Russian Federation

Abstract

An absorption spectrum of the SnH₄ molecule has been measured with Doppler limited resolution in the region of 1903 - 1960 cm^-1 by means of a tunable diode laser spectrometer. Infrared transitions of the Q- and R-branches of allowed (nu) ₃ (F₂) and 'forbidden' (nu) ₁ (A₁) bands were observed. These two states were found to be strongly mixed by the rotational-vibrational interaction, and as a consequence the (nu) ₁ band appears in absorption. Wave numbers of transitions to the (nu) ₁, (nu) ₃ energy levels with the quantum number of angular momentum J equals 1 - 15 have been obtained with an accuracy of about 0.001 cm^-1. More than 230 transitions of the ¹²⁰SnH₄ isotopic species were used for simultaneous analysis of the (nu) ₁, (nu) ₃ resonance states. In this way, 21 spectroscopic parameters of the upper states have been determined using a model Hamiltonian, which explicitly takes into account the resonance interaction. The parameters obtained reproduce the experimental spectrum with r.m.s. discrepancy of 0.002 cm^-1.

Citation Download Citation

V. M. Krivtsun, D. A. Sadovskii, and E. P. Snegirev "Study of the v1,v3 bands of ¹²⁰SnH₄: Part I--diode laser spectroscopy", Proc. SPIE 1724, Tunable Diode Laser Applications, (1 April 1992); https://doi.org/10.1117/12.58667

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