Free radicals Rydberg radical

C. G. Chatgilialoglu and M. Guerra,/. Am. Chem. Soc., 112, 2854 (1990). MSXa Study of Absorption Spectra of Free Radicals. Characterization of Rydberg and Valence Transitions in Alkyl Derivatives of Group 14 Centered Radicals. 

Photoelectron spectroscopy can also be carried out by measuring the distribution of flight times of photoemitted electrons. This method is useful in systems in which the absorbing species are produced by a pulsed source and the photolysis radiation is also pulsed. These electron time of flight methods have been used to elucidate structures of transient species such as free radicals and clusters produced in pulsed photolysis sources and in assessing the vibrational-state purity of ions produced in multiphoton ionization processes, particularly those in which the final photon absorption process is from a Rydberg state whose geometry is similar to that of the ion. 

Figure 17.1 TOF spectrum of H atoms, produced from the photodissodation (at A = 211.51 nm (top) and A = 211.75 nm (bottom)) of jet-cooled C2H2, using the Rydberg tog gyng technique. The rotationally resolved structure yields detailedinformation on theenergy distribution in theC2H(X) fragment and also provides information on the absolute structure of this free-radical. Note that the horizontal axis has been converted to show the H atom total kinetic energy release. Adapted from Mordaunteto/, J. Chem. Phys., 1998, 108 519, with permission of the American Institute of Physics...

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