13_580ln_fa08

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. Obtain spectrum essentially identical to an absorption spectrum.
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13_580ln_fa08 - MIT OpenCourseWare http:/ocw.mit.edu 5.80...

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