Magneto-optical properties of the photon echo: status of research and prospects of application

The results of the study of the polarization properties of the stimulated photon echo (SPE) excited at room temperature on free excitons and exciton states localized on surface defects of textured thin films are reported. The results of observation and investigation of the effect of the non-Faraday rotation of a femtosecond SPE in a textured thin film are presented. The physical processes occurring under the Faraday effect and the effect of the non-Faraday rotation of the photon echo (PE) polarization plane are compared

Erratum - Study of fast photoprocesses in biomolecules with the aid of a femtosecond laser spectrometer

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Study of fast photoprocesses in biomolecules with the aid of a femtosecond laser spectrometer

The paper describes the femtosecond laser spectrometer used at the Institute of Spectroscopy, USSR Academy of Sciences, to carry out ultrafast spectroscopic experiments with biomolecules and presents the results of experimental studies of the primary photoprocesses occurring in the reaction centres, both intact and modified, of purple bacteria. The experiments have shown that the charge separation process proceeds with the participation of monomer bacteriochlorophyll.Cet article décrit le spectromètre laser femtoseconde utilisé à l'Institut de Spectroscopie de l'Académie des Sciences de l'URSS pour des expériences de spectroscopie ultrarapide avec les molécules biologiques. On présente les résultats des études expérimentales sur des photo-processus primaires dans les centres réactifs, intacts et modifiés, de la bactérie pourpre. Les expériences ont montré que le processus de séparation de charges implique la participation de la bactériochlorophylle monomère

Long–lived femtosecond photon echo in thin films on localized exciton states at room temperature

Long–lived femtosecond photon echo was excited at room temperature in a two–photon regime on the charged exciton states (trion type) localized on the surface defects of a three–layer textured ZnO/Si(B)/Si(P) film with the thickness of each layer at 100 nm in a longitudinal uniform magnetic field. The irreversible longitudinal relaxation time T1 for the long–lived photon echo regime was of the order of 40 ps, whereas when measured with the help of the stimulated photon echo generated in the single–photon mode, the value was found not to exceed 600 fs

Ultrafast dynamics of photoprocesses induced by femtosecond IR laser radiation in iron pentacarbonyl molecules and clusters

Ultrafast dynamics of photoinduced processes in [Fe(CO)5]n clusters and free Fe(CO)5 molecules excited by resonant femtosecond IR radiation (λ ~ 5 μm) were studied in a molecular beam. Using a pump-probe teqnique characteristic rates of these processes were obtained and theoretically analyzed

Long–lived femtosecond photon echo in thin films on localized exciton states at room temperature

Long–lived femtosecond photon echo was excited at room temperature in a two–photon regime on the charged exciton states (trion type) localized on the surface defects of a three–layer textured ZnO/Si(B)/Si(P) film with the thickness of each layer at 100 nm in a longitudinal uniform magnetic field. The irreversible longitudinal relaxation time T1 for the long–lived photon echo regime was of the order of 40 ps, whereas when measured with the help of the stimulated photon echo generated in the single–photon mode, the value was found not to exceed 600 fs

Ultrafast dynamics of photoprocesses induced by femtosecond IR laser radiation in iron pentacarbonyl molecules and clusters

Ultrafast dynamics of photoinduced processes in [Fe(CO)5]n clusters and free Fe(CO)5 molecules excited by resonant femtosecond IR radiation (λ ~ 5 μm) were studied in a molecular beam. Using a pump-probe teqnique characteristic rates of these processes were obtained and theoretically analyzed

Intramolecular vibrational dynamics of ν 1

Intramolecular dynamics of the vibrational levels (up to v = 5) of the ν1 mode in (CF3)2CCO molecule, induced via multiphoton selective excitation of this mode by resonant femtosecond IR radiation, was studied. The times of intramolecular vibrational energy redistribution (IVR) of each vibrational level v to the remaining modes of the molecule were measured. In accordance with the theory predictions the decrease of IVR time with increasing v is observed. A sharp reduction of the IVR time (up to 1 ps) at a wavelength of 2130 cm−1 of transition v=3 → v=4 was found. It was shown that with a negative chirp of a femtosecond radiation pulse the population of high-lying vibrational levels of ν1 modes significantly increases

Magneto-optical properties of the photon echo: status of research and prospects of application

The results of the study of the polarization properties of the stimulated photon echo (SPE) excited at room temperature on free excitons and exciton states localized on surface defects of textured thin films are reported. The results of observation and investigation of the effect of the non-Faraday rotation of a femtosecond SPE in a textured thin film are presented. The physical processes occurring under the Faraday effect and the effect of the non-Faraday rotation of the photon echo (PE) polarization plane are compared