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Introduction to the spectroscopy of weakly-bound molecules
1. Introduction and early history
1.1. 1960s, classical IR absorption in gas cells
1.2. 1970s, MBER; LIF; FTMW
1.3. 1980s, IR lasers; bolometer detectors
2. Free internal rotation in complexes containing hydrogen
2.1. H2-Ar, free rotor model
2.2. H2-H2, hydrogen dimers on Jupiter
2.3. D2-D2, combination differences
3. Comparison of some experimental techniques for IR absorption
3.1. Cold gas cell (equilibrium) versus supersonic jet (non-equilibrium)
3.2. FTIR versus laser
3.3. Details of NRC apparatus
4. Simple complexes containing carbon monoxide
4.1. CO-Ar / Kr
4.2. CO-He
4.3. CO-paraH2, CO-orthoD2
5. Comparison of four-atomic complexes containing CO and N2
5.1. N2-N2
5.2. CO-N2
5.3. CO-CO
6. (NO)2, a dimer which is more strongly bound
6.1. Fundamental intramolecular vibrations (N-O stretching)
6.2. Fundamental intermolecular vibrations (far-infrared)
6.3. Combination bands and overtones
Students will prepare short reports on a selected topic
Intermolecular forces are important for collisional dynamics, energy transfer, line broadening, clustering, condensation, etc. High resolution spectroscopy of bound-bound transitions in weakly-bound molecules (窶忻an der Waals complexes窶) is now the most direct and precise technique to probe the intermolecular potential energy surface in the region of the attractive minimum. The lectures outline some history of this field, and focus on infrared and microwave studies of systems containing fundamental atoms and molecules like He, Ar, H2, N2, and CO.