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Winspec illustrates aspects of the microwave spectra of linear molecules. It is based on a DOS program by the same authors previously published by JCE: Software (1). Spectra showing a range of features can be easily and quickly generated. Qualitative effects of temperature, centrifugal distortion, isotopic substitution, rotation-vibration interaction, l-type doubling, nuclear quadrupole interaction, line width and an electric field can be observed. By measuring the positions of the peaks it is possible to determine numerically
- rotational and centrifugal distortion constants
- bond lengths in a linear heteronuclear triatomic molecule
- rotation-vibration constants and equilibrium rotational constants
- l-type doubling constants
- nuclear quadrupole coupling constants
- dipole moments
- bond lengths, vibrational frequencies, anharmonicity constants, and dissociation energies of heteronuclear diatomic molecules.
Lectures on microwave spectroscopy are commonly included in the undergraduate curriculum; however, few institutions have microwave spectrometers in the undergraduate laboratories.
This screen from Winspec allows you to change conditions to illustrate the Stark Effect for the 2<--1 transition.
This program is designed to give students a feel for the general appearance of microwave spectra and experience in calculating molecular parameters from measurements on spectra.
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