Double resonance Rydberg states

K. Yamanouchi Recently, we investigated the interatomic potential VRyd(/ ) of the Rydberg states of a HgNe van der Waals dimer by optical-optical double-resonance spectroscopy. It was demonstrated that VRyd(/ ) sensitively varies as a function of the principal quantum number n [J. Chem. Phys., 98, 2675 (1993) ibid., 101, 7290 (1995) ibid., 102, 1129 (1995)], and in the lowest Rydberg states of Hg(7 3S )Ne and Hg(7 5o)Ne, the interatomic potentials exhibit a distinct barrier at around R 4 A. The existence of the barrier was interpreted in terms of a repulsive interaction caused by the Is Rydberg... 

The determination of the NH and OH stretching vibrations of 4-aminophenol and 4-aminophenol bonded to a water molecule, in the neutral and ionic ground state, is carried out by infrared double resonance techniques (infrared-photo-induced Rydberg ionization, IR/R2PI). By means of this method it is possible to state that the more stable structures of the cluster of a 4-aminophenol/water system, as reported in Scheme 15, are 74 and 75 for the neutral species and 76 and 77 in the ionic state145. 

The nonradiative decay pathways for the (X2E+ )np Rydberg states of H2 have been examined by McCormack, et al, (1993). Selected vibrational-rotational levels of the E, FXE+ state were excited by two-photon transitions from the X E+ state and the ungerade Rydberg states were examined by a double resonance excitation scheme via the selected levels of the E, F state. 

OlGit Gittins, C.M., Harris, N.A., Hui, M., Field, R.W. Ionization-detected optical-optical double resonance spectroscopic studies of moderate energy Rydberg states of calcium monofluoride. Can. J. Phys. 79 (2001) 247-286. 

R.A. Bemheim, L.P. Gold, T. Tipton, Rydberg states of Li2 by pulsed optical-optical double resonance spectroscopy. J. Chem. Phys. 78, 3635 (1983) ... 

R. Zhao, l.M. Konen, R.N. Zare, Optical-optical double resonance photoionization spectroscopy of nf Rydberg states of nitric oxide. J. Chem. Phys. 121, 9938 (2004)... 

Of particular importance for the spectroscopy of highly excited states, such as Rydberg levels of atoms and molecules, and for the assignment of complex molecular spectra are various double-resonance techniques where atoms and molecules are exposed simultaneously to two radiation fields resonant with two transitions sharing a common level. In combination with Doppler-free techniques, these double resonance methods are powerful tools for spectroscopy. Some of these methods, representing modem versions of optical pumping techniques of the prelaser era, are introduced in Chap. 10. 

Figure 19. High-resolution spectrum of the 6sl4d Rydberg state of barium recorded by optical-optical double resonance. (Taken from Ref. 50.)...

Figure 23. High-resolution spectrum of the 65155 Rydberg state of Ba, obtained by optical-optical double resonance (cf. Section 2.2.4). The signals of the odd isotopes have been labeled F -fy according to the hyperfine levels of the intermediate and final state. (Taken from Ref. 55.)...

Figure 49. Doppler-free spectrum of the 65164 D2 Rydberg state of Ba, obtained by optical-optical double resonance. The hyperfine components of have been labeled...

For the triplet Rydberg states detected by resonance-enhanced multiphoton ionization (REMPI) of NH, ND(X Z") the following spin-orbit, spin-rotation, spin-spin coupling, and A-doubling constants were derived for the v = 0 levels (in cm ) [31] (preliminary results for the B state in [32]) ... 

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