SIDE-BAND OPTICAL-OPTICAL DOUBLE-RESONANCE ZEEMAN SPECTROSCOPY .3. ANALYSIS OF COMPOSITE LINES AND SELECTIVE DETECTION

Sideband optical-optical double resonance Zeeman spectroscopy is appli ed here to studies of the electronic spectrum of gas-phase PtH. Even t hough each rotational transition is a composite line with closely spac ed isotope and hyperfine structure, the sub-Doppler Zeeman spectrum of each feature has been recorded and analyzed using a systematic, quasi -two-dimensional approach. Sub-Doppler radio frequency magnetic resona nces, in addition to their diagnostic power to assist rotational and e lectronic assignment, can also be used to detect selectively other tra nsitions with the same Zeeman properties; if a fixed magnetic field is applied and the sub-Doppler signal recorded as the laser is scanned, spectral features which share the common Zeeman splitting in either th e lower or upper state can be detected. Several examples illustrating the selectivity of this scheme are given. (C) 1997 American Institute of Physics.