Deducing rotational quantum-state distributions from overlapping molecular spectra

Molecular Rotational Spectra

Rotational spectra of diatomic molecules measured in the high-precision experiments are analyzed. Such a spectrum is usually fitted by an 8th order polynomial in spin. In fact, from the theoretical point of view, the rotational spectrum is expected to be a smooth function of spin. Thus, fitting the rotational spectrum in terms of a low order polynomial in spin seems to be justified. However, th...

Information recovery from overlapping GAIA spectra

The RVS instrument aboard GAIA is a slitless spectrograph, so some spectral tracing overlap is inevitable. We show that this background can be accurately modeled and subtracted. Radial velocity accuracy is not degraded significantly unless the star density is higher than the value typical for the Galactic plane.

Controlling rotational state distributions using two-pulse stimulated Raman excitation

Fragment Rotational State Distributions From The Dissociation Of NeIBr: Experimental And Theoretical Results

The IBr fragment rotational state distributions that result when the NeIBr van der Waals molecule undergoes vibrational predissociation have been measured in a pump-probe laser-induced fluorescence experiment. Independent of initial vibrational state and the number of quanta of vibrational energy lost from the I-Br coordinate, the rotational distributions extend over the full range of energetic...

Molecular Vibrational Spectra in the Solid State

The site and factor group methods of interpreting solid state vibrational spectra are compared. As examples. K2TiF6 (which has one molecular unit in a unit cell) and K2ZrF5 (which has eight in a non-primitive unit cell) are considered. Benzenetricarbonylchromium enables a distinction between site and factor group methods. The modification of the latter needed to account for the spectra of Cr(CO...