Publication

Ultrafast intramolecular and caging dynamics from resonance Raman spectroscopy of I2 in solutions

Majed Chergui
1996
Conference Papers

Abstract

The resonance Raman overtone progressions of I2 in liq. Xe and in CCl4 following excitation in the bound and continuum parts of the B state are discussed and compared with theor. simulations. The intensity distribution of the Raman overtones yields information about the wave packet dynamics in the excited state. The Raman contribution from the bound part can be treated as that of an out going wave packet. This indicates damping within one recurrence due to predissocn. to the repulsive B, a and a' states. The curve crossing can be localized in space and time from the Raman data. The Landau-Zener formalism gives a consistent description and coupling matrix elements are deduced which are similar for I2 in liq. Xe and in CCl4. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/f7ebc8ef-1a95-46d2-a6ab-4b42e92867ff

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Majed Chergui
1996
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f7ebc8ef-1a95-46d2-a6ab-4b42e92867ff

About this result

Related concepts (21)

Raman spectroscopy

Raman spectroscopy (ˈrɑːmən) (named after Indian physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. Raman spectroscopy is commonly used in chemistry to provide a structural fingerprint by which molecules can be identified. Raman spectroscopy relies upon inelastic scattering of photons, known as Raman scattering.

Raman scattering

Raman scattering or the Raman effect (ˈrɑːmən) is the inelastic scattering of photons by matter, meaning that there is both an exchange of energy and a change in the light's direction. Typically this effect involves vibrational energy being gained by a molecule as incident photons from a visible laser are shifted to lower energy. This is called normal Stokes Raman scattering. The effect is exploited by chemists and physicists to gain information about materials for a variety of purposes by performing various forms of Raman spectroscopy.

Resonance Raman spectroscopy

Resonance Raman spectroscopy (RR spectroscopy or RRS) is a variant of Raman spectroscopy in which the incident photon energy is close in energy to an electronic transition of a compound or material under examination. This similarity in energy (resonance) leads to greatly increased intensity of the Raman scattering of certain vibrational modes, compared to ordinary Raman spectroscopy. Resonance Raman spectroscopy has much greater sensitivity than non-resonance Raman spectroscopy, allowing for the analysis of compounds with inherently weak Raman scattering intensities, or at very low concentrations.

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Ultrafast intramolecular and caging dynamics from resonance Raman spectroscopy of I2 in solutions

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