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The Spectra and Dynamics of Diatomic Molecules: Revised and by Helene Lefebvre-Brion, Robert W. Field

By Helene Lefebvre-Brion, Robert W. Field

This ebook is written for graduate scholars simply starting examine, for theorists interested in what experimentalists truly can and do degree, and for experimentalists bewildered via idea. it's a advisor for strength clients of spectroscopic info, and makes use of language and ideas that bridge the frequency-and time-domain spectroscopic groups.

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When a spectrum is complex, it is useful t o have an experimental scheme that isolates certain key features of an assignment scheme in order t o lead the experimenter unambiguously to correct assignments or t o test whether a plausible assignment is in fact correct. Typically the question is one of linkage: (1) do two transitions share a common level? (2) what are some same-J A 2 F ( J ) rotational combination differences in different substates or in consecutive vibrational levels (see Fig. 11)?

11)? 11: Lower state rotational combination differences for two consecutive vibrational levels. 12: Lower state rotational combination differences for two consecutive members of the same branch. A2F1'(n 1) - A2F1'(n)= 4B". + signed) members of a branch fragment (see Fig. 12)? Questions of linkage are posed and answered by asking the molecule to satisfy successively two resonance conditions. 3). A dispersed fluorescence (DF) spectrum isolates individual pairs of P, R, lines from which AzF" values may be directly measured.

Sometimes the goal is not to record a spectrum but to monitor the concentration of a specific trace species, such as CO emission in the exhaust from an automobile or unwanted OH radicals above the surface of a silicon substrate being plasma-etched. In such a case it would be unnecessary t o scan over a continuous segment of a spectrum, nor would it be necessary t o make rotational assignments. , the peaks of two similar-J lines (peak-1, peak-2), selected to be free of overlap with absorption lines belonging t o the most probable interfering species, plus one or two baseline frequencies (baseline ( u l ) ,baseline (vz)),at which no absorption from the target or an interfering species is expected.

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