By Williams, Dudley
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Extra resources for Methods of Experimentul Physics MOLECULAR PHYSICS
Sample Handling With ordinary samples which do not react with glass, metal, or stopcock grease, a glass gas handling system can be used with no exceptional precaution. 1 mm Hg. Samples which react with the absorption cell walls are best handled with a flow system. The sample is admitted through a n adjustable leak into one end of the cell, and the cell is evacuated continuously. The leak is adjusted for optimum sample pressure. This continuously sweeps out decomposition products as well as any material which may outgas from the cell walls.
The principal moments of this assumed structure are computed. The effects of symmetry, the hyperfine splitting and Stark shifts are considered and the approximate frequencies and intensities of the permitted transitions are estimated. The region where the information should be most readily obtained is then searched. If lines are found, conditions such as sample pressure and microwave power are adjusted for optimum presentation of the lines. The frequencies of the lines are determined. The J value of the transition is identified from either the hyperfine struct,ure or from Stark resolution.
A,b,c) Typical nuclear HFS for diatomic molecule. (d) For asymmetric top molecule. 20 2. MOLECULAR SPECTROSCOPY gradient are taken in the direction of this principal axis. For an asymmetric top molecule, the AJ = 0 transitions often have unique structures that permit the direct identification of the J level involved in the transition. The splittings of the levels involved contain a s factors the Casimir function. For example, Fig. 3c gives the splitting of a J = 4 + J = 4 transition of a molecule with one nuclear spin I = g.