Two-photon excitation spectra

Mikami N and Ito M 1975 Two-photon excitation spectra of naphthalene and naphthalene-dg Chem. Rhys. Lett. 31 472-8... 

Walla, P. J., Linden, P. A., Ohta, K., and Eleming, G. R. 2002. Excited-state kinetics of the carotenoid S-1 state in LHC n and two-photon excitation spectra of Intein and beta-carotene in solution Efficient car S-1 -> Chi electronic energy transfer via hot S-1 states J. Phys. Chem. A 106 1909-16. 

Figure 5. Single (absorption) and two-photon (excitation) spectra of retinol showing the low-lying 1Ag state. (From ref. 118.)...

Quantum chemical calculations essentially confirm the above simple model for the trans-cis isomerization of stilbene. Two-photon excitation spectra and more recent calculations indicate, however, that contrary to what is shown in Figure 7.3a, it is not the lowest but rather a higher excited A state of rra/i,v-stilbene that correlates with the lowest excited singlet state... 

Figure 3.49. Two-photon excitation spectra in toluene (a) 103a, (b) 99, (c) 102, (d) 100. Inset is the square dependence of the TPEF as a function of the laser power used. (Adapted from Ref. [224].)...

Fig. 15a, b Two-photon excitation spectra of a single crystal of Cs2NaTbCl6 at ca. 6 K a in two linear polarizations making the angle indicated to [100] b in the presence of a 4.5 T field along [110]. The inset shows the 5D4 energy level scheme of Tb3+ in this system. (Adapted from [223])... 

Pyrene photophysics has produced the usual, and now to be expected, crop of papers on diverse topics. Aggregation in concentrated solutions has been evidenced by the Shpol ski effect and two photon excitation spectra have yielded new electronic state assignments. The maximum entropy method, mentioned earlier, for the determination of fluorescence lifetimes shows that in dipyrenylpropane the data for luminescence decay do not fit a simple 3-state model.This study adds more information upon a system hitherto open to much dispute. It is unlikely that the problem will be considered as solved. The presence of a ground state dimer of pyrene moieties has been shown by NMR in the bichromophoric molecules of (pyrenylcarboxyl) alkanesand also with racemic and meso dipyrenyl alkanes. Strong circular polarization in excimer emission has been detected from pairs of pyrene groups linked to a polypeptide chain. ... 

The UV-absorption spectrum of frans-stilbene exhibits two main bands with maxima near 280 nm (A-band) and 230nm (B-band) [22, 54, 78, 79], The A-band of ris-stilbene is attributed to a (n, n ) transition [80], As compared to frans-stilbene it is blue-shifted, much broader, and has a considerably lower molar absorption coefficient (ec) [24], For the B-band, cc is greater than e, (Figure 1) the origin of the absorption transition in ris-stilbene is red-shifted relative to the same transition in frans-stilbene [81], Two-photon excitation spectra (< 5 x 104cm ), together with theoretical calculations, indicate seven excited singlet states [38]. 

Figure 11 One-photon absorption, fluorescence, and two-photon excitation spectra of diphen-ylhutadiene in ERA at 77 K. The two-photon excitation spectrum is plotted versus where is the wavelength of the laser excitation (Reproduced by permission from J. Chem. Phys., 1980, 73, 4231).

Figure 10. Two-photon excitation spectra of 5s99d Dj and SslOOs 5 Rydberg states of Sr. (Taken from Ref. 25.) The upper part was recorded using a ring diode, while the lower part was produced with a conventionally shielded diode. The spectra were obtained using the setup shown in Figure 9.

Figure 26. Doppler-free two-photon excitation spectra of Ssns So Rydberg states of Sr. (Taken from Ref. 59.)...

R.G. Bray, R.M. HochstraOer, H.N. Sung Two photon excitation spectra of molecular gases New results for benzene and nitricoxide. Chem. 

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