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13_580ln_fa08 - MIT OpenCourseWare http/ocw.mit.edu 5.80...

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MIT OpenCourseWare http://ocw.mit.edu 5.80 Small-Molecule Spectroscopy and Dynamics Fall 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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5.80 Lecture #13 Fall, 2008 Page 1 of 6 pages Lecture #13: Laser Schemes for Rotational Assignment First Lines for , Assignments Last Time: Lagerqvist Strips – use of known 2 F(J) for either upper or lower state. Simultaneous analysis of two vibrationally linked bands: search for a C.D. that appears once in each band correct numbering of R relative to P branch and correct absolute numbering Computer automated term value method — valuable when there is no pattern. Based on term value redundancies from two linked bands and supplemented by intensity regularity. Problem is that combination differences are “lost in crowd” Today: Patterns revealed by laser spectroscopy Fluorescence Excitation Spectroscopy = Laser Induced Fluorescence (LIF) Dispersed Fluorescence (DF) Wavelength Selective Fluorescence Excitation (Also lifetime-selected LIF) OODR and SEP Introduction to spectra for Λ 0 and/or S 0 states Diagrams of allowed transitions First lines as diagnostics Unlinked sub-manifolds — need a model Pattern-forming rotational quantum numbers Next time: Read * JTH, pp. 1-9 (at least) * Symbols for Spectroscopy * Report of sub-committee f * nomenclature * Rotation and Angular Momenta II * Energy level Structure of 2 and 2 + states and JTH pages 9-13 What advantages might a laser bring to the assignment of an electronic band system? 1. Fluorescence Excitation Spectrum (known as LIF) Scan laser, recording total fluorescence resulting as laser frequency is tuned.
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