Infrared spectra and structures of SiH₄ and GeH₄ dimers in low-temperature nitrogen matrixes.

IR absorption spectra of monoisotopic silane (28)SiH4 and germane (76)GeH4 are studied in nitrogen matrixes at T = 11 K. It is shown that the absorption spectra of silane and germane are similar in the regions of the ν3 stretching and ν4 bending vibrations. A significant influence of a nitrogen matrix on the absorption spectra of XH4 molecules was established.

Calculation of structural and spectroscopic parameters of trans-DONO and the NH3···trans-DONO complex. Comparison with analogous parameters of trans-HONO and NH3···trans-HONO.

The frequencies and absolute intensities for transitions between vibrational states of trans-DONO and NH3···trans-DONO are calculated using the approach earlier tested in calculations of trans-HONO and NH3···trans-HONO. The spectroscopic parameters were obtained in the harmonic approximation and from variational solutions of anharmonic Schrödinger equations in one to four dimensions with accurate potential energy and dipole moment surfaces. The calculated frequencies of trans-DONO are in good agreement with the experimental data.

Influence of resonance interactions and matrix environment on the spectra of SF(6) dimers in low-temperature nitrogen matrixes. Theory and experiment.

The IR absorption spectra of (SF(6))(2) dimers were studied in N(2) matrixes at 11 K. Absorption bands due to SF(6) monomers and to (SF(6))(2) dimers have been identified. As a result of the resonance dipole-dipole interaction between two SF(6) subunits, the band of the triply degenerate vibration nu(3) is split into two components nu(X),(Y) and nu(Z), where Z is the axis connecting the two sulfur atoms.