Cleaning a painting apparatus

Abstract

The FTIR spectrum of monoisotopic H374GeF recorded with a resolution of ∼2.5 × 10−3 cm−1 (fwhm) has been investigated in the region of the ν2ν5 band, ν20 873.82345(2) and ν50 873.98095(1) cm−1. Strong perturbations were observed, and different models were tested. With an interaction model comprisng qt(+) and rt resonance within ν5 and Coriolis x, y, and α resonance between ν2 and ν5, ultimately 4768 rovibrational lines including 23 perturbation-allowed transitions were fitted to 32 excited state parameters with σ = 1.5 × 10−4 cm−1. In addition, ΔK = ±3 perturbations between ν2, K and ν3, (K + 3) levels and ν5, kl and ν6, (kl − 3) sublevels were detected and fitted, and likely locations of similar perturbations in other halides H3EX of group IV elements E are predicted. The intensity perturbation M2ζ2,5yM5 was found to be positive, and a transition moment ratio |M2:M5| = 0.77(5) was determined. In order to derive the equilibrium rotational constants for H374GeF, Ae = 2.63241(2) and Be = 0.3355664(8) cm−1, the ν1ν4 band was studied by Doppler-limited FTIR spectroscopy and examined in some detail. Although abundant perturbations of nearly all K and kl levels, respectively, were substantiated, these were shown to be mostly of rotational type and local. About 650 almost unperturbed transitions with J′ ≦ 40 were selected and fitted to a model complete to quadratic diagonal terms, σ = 9 × 10−4 cm−1. Effective band origins were determined, ν10 2123.3031(1) and ν40 2131.0359(1) cm−1.