Molecular photoionization

AP. de Silva, H.QN. Gunaratne, C.P. McCoy, Molecular photoionic AND logic gates with bright fluorescence and off-on digital action , J. Am. Chem Soc 1997, 119, 7891-7892. 

Molecular photoionic devices with switchable response, at the ensemble level, display nonlinear in/out characteristics which can be operated either as analogue or digital devices by proper control of the ion concentration input variable. When... 

I. Cacelli, V. Carravetta, R. Moccia, Molecular photoionization cross sections and asymmetry parameters by L2 basis functions calculations H2O, J. Chem. Phys. 85 (1986) 7038. 

P.W. Langhoff, Stieltjes-Tchebycheff moment-theory approach to molecular photoionization studies, in T. Rescigno, V. McKoy, B. Schneider (Eds.), Electron-Molecule and Photon-Molecule Collisions, Plenum, New York, 1979 A.U. Hazi, Stieltjes-moment-theory technique for calculating resonance widths, in T. Rescigno, V. McKoy, B. Schneider (Eds.), Electron-Molecule and Photon-Molecule Collisions, Plenum, New York, 1979. 

F. Miiller-Plathe, G.H.F. Diercksen, Molecular photoionization cross sections by moment theory. An introduction, in S. Canuto, J. D Albuquerque e Castro, F.J. Paixao (Eds.), Electronic Structure of Atoms, Molecules and Solids, World Scientific, Singapore, 1990 F. Miiller-Plathe, G.H.F. Diercksen, Perturbative-polarization-propagator study of the photoionization cross section of the water molecule, Phys. Rev. A 40 (1989) 696. 

K. Gokhberg, V. Vysotskiy, L.S. Cederbaum, L. Storchi, F. Tarantelli, V. Averbukh, Molecular photoionization cross sections by Stieltjes-Chebyshev moment theory applied to Lanczos pseudospectra, J. Chem. Phys. 130 (2009) 064104. 

Lucchese, R.R., Takatsuka, K. and McKoy, V. (1986). Applications of the Schwinger variational principle to electron-molecule collisions and molecular photoionization, Phys. Rep. 131, 147-221. 

Fluorescent PET (photoinduced electron transfer) sensors are considered to be those molecular systems where the binding of ions and other species leads to the perturbation of the competition between the de-excitation pathways of fluorescence and electron transfer. The early developments in this field are traced and the design logic of these sensors is detailed. A variety of examples drawn from different areas of chemistry are classified according to the fluorophore-spacer-receptor format and their photophysical behaviour is rationalized in terms of fluorescent PET sensor principles. Cases are pointed out where such experimental data are unavailable but desirable. During these discussions, the relevance of twisted fluorophore-receptor systems and the contrast with integrated fluorophore-receptor systems is noted. The utility of the fluorescence on-ofP phenomenon in these PET sensors for the area of molecular photoionic devices is pointed out. 

Fig. 6. The interpretation of a fluorescence intensity-pM profile of a fluorescent PET sensor as an input/output characteristic of a molecular photoionic device...

Even more drastic modifications of the response range can be imagined and, when realized, should lead to sensors with specialized applications and molecular photoionic devices with a variety of input/output characteristics. The latter point takes on special significance when we remember that the availability of the corresponding devices in vacuum- and solid state-electronics led the surge in electronics technology which touches our lives today in so many ways. 

Dill, D., and J. L. Dehmer (1974). Electron-molecule scattering and molecular photoionization using the multiple scattering method. J. Chem. Phys. 61, 693-99. 

While a great deal of effort has been spent on the interpretation of energies, a much less number of studies have been published of the corresponding intensities in photoelectron spectra of molecules Due to the lack of information on the molecular photoionization cross-sections, in most cases the simple semiempirical formula proposed by Gelius is used [41] ... 

Topics of relevance to the content of this chapter which have been reviewed during the year include photoactive [2]rotaxanes and [2]catenanes, photochemical synthesis of macrocycles, phototransformations of phthalimido amino acids, photoaddition reactions of amines with aryl alkenes and arenes, photoreactions between arenenitriles and benzylic donors, photostability of drugs, polycyclic heterocycles from aryl- and heteroaryl-2-propenoic acids, photoreactions of pyrroles, photoamination reactions in heterocyclic synthesis, switching of chirality by light, photochromic diarylethenes for molecular photoionics and solid state bimolecular photoreactions. 

Simple molecular photoionization is the interaction of electromagnetic radiation with a molecule (in its ground state) to generate an ion (in a variety of different possible energy, and symmetry states) and a free electron Equation (17.2). In this process, mass, momentum and energy are conserved, according to Equation (17.3). 

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