Concept

Constante de Rydberg

Publications associées (52)

Ultrafast structural dynamics in electronically excited solid neon. I. Real-time probing of the electronic bubble formation

Majed Chergui, Franco Vigliotti, Luigi Bonacina

The dynamics of electron bubble formation upon excitation of the A(3ss) Rydberg orbital of NO in solid Ne was studied by conventional spectroscopy and fs pump-probe spectroscopy. The fs pump pulse initiates the formation of a bubble by the expansion of the ...

2003

Measurement of the damping rate of n=1 toroidal Alfven eigenmodes as a function of the neutral beam heating power and plasma beta on JET

Ambrogio Fasoli, Duccio Testa

The dependence of the measured damping rate upon the neutral beam heating power (P-NBI) and plasma beta has been experimentally investigated for n = 1 toroidal Alfven eigenmodes (TAEs) in JET limiter plasmas with a monotonic safety factor profile and low e ...

2003

Ultrafast expansion and vibrational coherences of electronic 'Bubbles' in solid neon

Majed Chergui, Franco Vigliotti

The dynamics of electron bubble formation upon excitation of the A(3ss) Rydberg orbital of NO in solid Ne was studied by femtosecond pump-probe spectroscopy. The authors observe an ultrafast expansion of the bubble, followed by a vibrational recurrence in ...

2002

Structural dynamics in quantum solids. I. Steady-state spectroscopy of the electronic bubble in solid hydrogens

Majed Chergui, Franco Vigliotti

The structural changes due to formation of electronic bubbles in solid D2 are studied by fluorescence, fluorescence-excitation, and fluorescence-depletion spectroscopy of the lowest Rydberg state, A 2S+(3ss), of the NO impurity. The A X band is strongly bl ...

2002

Ultrafast Structural dynamics in solid hydrogens: A model for condensed phase quantum systems

Majed Chergui, Franco Vigliotti, Luigi Bonacina

Structural dynamics in solid hydrogens is impulsively triggered by femtosecond excitation of the lowest Rydberg state of the NO impurity. The resulting charge redistribution induces a local radial deformation of the medium ("bubble" formation) around the ...

2002

First-principles modeling of paramagnetic Si dangling-bond defects in amorphous SiO2

Alfredo Pasquarello

We modeled paramagnetic Si dangling-bond defects in amorphous SiO2 using a generalized-gradient density-functional approach. By creating single oxygen vacancies in a periodic model of amorphous SiO2, we first generated several model structures in which the ...

2002

Structural dynamics in quantum solids. II. Real-time probing of the electronic bubble formation in solid hydrogens

Majed Chergui, Franco Vigliotti, Luigi Bonacina

The ultrafast dynamics of electronic bubble formation upon excitation of the A(3ss) Rydberg state of NO trapped in solid H2 and D2 was studied by femtosecond pump-probe spectroscopy. The evolution of the spherical bubble is followed in real time by a probe ...

2002

The medium response to an impulsive redistribution of charge in solid argon: molecular dynamics simulations and normal mode analysis

Majed Chergui

Excitation of the A(3ss) Rydberg state of NO leads to an extensive rearrangement of the environment, which was studied by classical mol. dynamics simulations and normal mode anal., using pair potentials from the literature. The medium response is independe ...

2001

Structural dynamics in quantum solids

Majed Chergui

Structural dynamics in semi-quantum and quantum solids (Ne, H2 and D2) is reported, and compared to results in classical solids such as Ar. The structural dynamics is driven by excitation of the lowest Rydberg state of the NO impurity. The resulting charge ...

2001

Impurity Rydberg states as probes of local dynamics in the condensed phase

Majed Chergui, Franco Vigliotti

We report on structural dynamics in simple van der Waals solids (Ar, Ne, and H2), as driven by the excitation of an impurity (NO) Rydberg state. The resulting charge redistribution induces a local radial deformation of the medium ("bubble" formation). Th ...

2001

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