Vibrational energy relaxation dynamics of diatomic molecules inside superfluid helium nanodroplets. The case of the I2 molecule

2018 ◽  
Vol 20 (1) ◽  
pp. 118-130 ◽  
Author(s):  
Arnau Vilà ◽  
Miguel Paniagua ◽  
Miguel González
Keyword(s):  
Superfluid Helium ◽  
Vibrational Relaxation ◽  
Time Scale ◽  
Theoretical Study ◽  
Vibrational Energy ◽  
Diatomic Molecules ◽  
Relaxation Dynamics ◽  
Vibrational Energy Relaxation ◽  
Helium Nanodroplets ◽  
Quantum Approach

The vibrational relaxation (VER) of a X2 molecule in a 4He superfluid nanodroplet (HeND; 0.37 K) was studied adapting a quantum approach recently proposed by us. In the first theoretical study on the VER of molecules inside HeND the I2 molecule was examined [cascade mechanism (ν → ν − 1; ν − 1 → ν − 2; …) and time scale of ns].

Rotational energy relaxation quantum dynamics of a diatomic molecule in a superfluid helium nanodroplet and study of the hydrogen isotopes case

2019 ◽  
Vol 21 (37) ◽  
pp. 21007-21021 ◽  
Author(s):  
Miquel Blancafort-Jorquera ◽  
Arnau Vilà ◽  
Miguel González
Keyword(s):  
Diatomic Molecule ◽  
Superfluid Helium ◽  
Time Scale ◽  
Quantum Dynamics ◽  
Theoretical Study ◽  
Hydrogen Isotopes ◽  
Energy Relaxation ◽  
Rotational Energy ◽  
Rotational Relaxation ◽  
Quantum Approach

Rotational relaxation in a 4He superfluid nanodroplet is studied adapting a quantum approach recently proposed by us. In the first theoretical study on this problem several isotopes of H2 are examined (cascade mechanism, time scale of ns, etc.).

4s to 5s and 4p photoexcitation dynamics of K atoms from the surface of helium nanodroplets: a theoretical study

2019 ◽  
Vol 21 (7) ◽  
pp. 3626-3636 ◽  
Author(s):  
Maxime Martinez ◽  
François Coppens ◽  
Manuel Barranco ◽  
Nadine Halberstadt ◽  
Martí Pi
Keyword(s):  
Superfluid Helium ◽  
Density Functional ◽  
Theoretical Study ◽  
Density Functional Method ◽  
Potassium Atom ◽  
Functional Method ◽  
Time Dependent ◽  
Spin Orbit ◽  
Helium Nanodroplets

We study the photodissociation of the potassium atom from a superfluid helium nanodroplet upon 5s 2S or 4p 2P excitation using the time-dependent helium density functional method (He-TDDFT). The results show possible K spin–orbit relaxation.

scholarly journals Pump- And Probe-Wavelength Dependencies of Picosecond Anti-Stokes Raman Spectrum of Trans-Stilbene in the S1 State

1999 ◽  
Vol 19 (1-4) ◽  
pp. 75-78 ◽  
Author(s):  
Takakazu Nakabayashi ◽  
Hiromi Okamoto ◽  
Mitsuo Tasumi
Keyword(s):  
Vibrational Relaxation ◽  
Vibrational Energy ◽  
Wavelength Dependence ◽  
Relaxation Dynamics ◽  
Vibrationally Excited ◽  
Time Resolved ◽  
Probe Wavelength ◽  
Trans Stilbene ◽  
Pump And Probe ◽  
Anti Stokes

Vibrational relaxation dynamics of trans-stilbene in the S1 state immediately after photoexcitation is studied by picosecond time-resolved anti-Stokes Raman spectroscopy with several pump and probe wavelengths. Pump-wavelength dependence of the anti- Stokes spectrum indicates that, when pump photons with high excess energy (≈5200cm-1) are used, the anti-Stokes Raman bands at 0 ps delay time arise from vibrationally excited transients with excess vibrational energy not thermally distributed in the molecule. Probe-wavelength dependence suggests that the vibrationally excited transients at 0 ps are mostly on the lowest excited vibrational levels, as far as the olefinic C═C stretching and the C–Ph stretching modes are concerned. The vibrational relaxation process of S1trans-stilbene is discussed on the basis of the observed results.

scholarly journals Picosecond-Duration Vibrational Relaxation Kinetics in the Excited S1 State of Perylene and Anthracene Molecules

1983 ◽  
Vol 3 (1-6) ◽  
pp. 249-261 ◽  
Author(s):  
A. Freiberg ◽  
T. Tamm ◽  
K. Timpmann
Keyword(s):  
Steady State ◽  
Luminescence Spectrum ◽  
Vibrational Relaxation ◽  
Vibrational Energy ◽  
Streak Camera ◽  
Relaxation Times ◽  
Temporal Behavior ◽  
Vibrational Energy Relaxation ◽  
The Matrix ◽  
Measured Relaxation

We present and discuss the results of a direct observation of the picosecond range temporal behavior of vibronic lines in the luminescence spectrum of the matrix-isolated perylene and anthracene molecules. A novel subtractive dispersion mount of monochromators in conjunction with the synchroscan streak camera has been used. From spectrochronograms measured at different excitation wavelengths the vibrational energy relaxation times have been obtained. These are in the range of 20–30 ps and are most probably determined by the existence of the phonon bath of the matrix. A comparison of the measured relaxation constants with those estimated from the steady-state hot luminescence spectrum has been made.

Vibrational energy relaxation of a diatomic molecule in a superfluid liquid helium nanodroplet. Influence of the nanodroplet size, interaction energy and energy gap

2021 ◽  
Author(s):  
Miquel Blancafort-Jorquera ◽  
Miguel Gonzalez
Keyword(s):  
Potential Energy ◽  
Diatomic Molecule ◽  
Interaction Potential ◽  
Superfluid Helium ◽  
Vibrational Energy ◽  
Energy Gap ◽  
Energy Relaxation ◽  
Vibrational Energy Relaxation ◽  
Interaction Potential Energy ◽  
Size Interaction

The influence of the nanodroplet size, molecule-helium interaction potential energy and v=1-v=0 vibrational energy gap on the vibrational energy relaxation (VER) of a diatomic molecule (X2) in a superfluid helium...

Vibrational energy relaxation of adsorbate vibrations: A theoretical study of the H/Si(111) system

1996 ◽  
Vol 105 (20) ◽  
pp. 9371-9374 ◽  
Author(s):  
V. A. Ermoshin ◽  
A. K. Kazansky ◽  
K. S. Smirnov ◽  
D. Bougeard
Keyword(s):  
Theoretical Study ◽  
Vibrational Energy ◽  
Energy Relaxation ◽  
Vibrational Energy Relaxation
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