Hydrogen electronic transitions

The three bands in Figure 9.46 show resolved rotational stmcture and a rotational temperature of about 1 K. Computer simulation has shown that they are all Ojj bands of dimers. The bottom spectmm is the Ojj band of the planar, doubly hydrogen bonded dimer illustrated. The electronic transition moment is polarized perpendicular to the ring in the — Ag, n — n transition of the monomer and the rotational stmcture of the bottom spectmm is consistent only with it being perpendicular to the molecular plane in the dimer also, as expected. 

Draw successive orbits for the hydrogen electron at n = 1,2,3, and 4. Indicate by arrows transitions between orbits that lead to lines in the... 

C07-0131. A hydrogen atom undergoes an electronic transition from the = 4 to the = 2 state. In the process the H atom emits a photon, which then strikes a cesium metal surface and ejects an electron. It takes 3.23 X 10 J to remove an electron from Cs metal. Calculate (a) the energy of the — 4 state of the H atom (b) the wavelength of the emitted photon (c) the energy of the ejected electron and (d) the wavelength of the ejected electron. 

Over time, scientists sorted out the electron transitions that produce every line in the spectrum of hydrogen (Figure 4.4). The... 

Some years ago, Kamlet and Taft embarked upon a study of how solvents influence the properties of solutes, focusing initially upon the effects of hydrogen bonding upon electronic transitions.184185 This led eventually to an empirical relationship between a spectroscopic property X of a given solute, e.g., the position or intensity of a peak, and certain solvent parameters, a, p and it 186... 

G. C. Pimentel, Hydrogen bonding and electronic transitions The role of the Franck-Condon principle,. 1. Am. Chem. Soc. 79, 3323-3326 (1957). 

P-ketoacid, but these compounds are especially susceptible to loss of carbon dioxide, i.e. decarboxylation. Although P-ketoacids may be quite stable, decarboxylation occurs readily on mild heating, and is ascribed to the formation of a six-membered hydrogen-bonded transition state. Decarboxylation is represented as a cyclic flow of electrons, leading to an enol product that rapidly reverts to the more favourable keto tautomer. 

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