Abstract
The advent of single frequency tuneable lasers, e.g. dye lasers, will clearly open up the field of high resolution absorption spectroscopy in the visible region of the spectrum. However a tuneable narrow spectral width laser is not the only prerequisite for high resolution spectroscopy. Since doppler broadening is typically several hundred megahertz in the visible region, techniques for reducing doppler as well as collisional broadening must be employed. The method of saturated absorption (1–9) is a good and convenient way of eliminating doppler broadeninq. Another method is to use molecular beam techniques (10) which can eliminate both doppler and collisional broadening as well as collisional shift.
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