TY  - JOUR
A1  - Nest, Mathias
A1  - Klamroth, Tillmann
T1  - Correlated many-electron dynamics : application to inelastic electron scattering at a metal film
N2  - The multiconfiguration time-dependent Hartree-Fock and the time-dependent configuration interaction singles method are applied to the correlated many-electron dynamics of a one-dimensional jellium model system. We study the scattering of an initially free electron at a model film in the framework of both approaches. In particular, both methods are compared with regard to how they describe the underlying physical processes, namely inelastic electron scattering, inverse photoemission, and electron impact ionization
Y1  - 2005
ER  - 
TY  - JOUR
A1  - Nest, Mathias
A1  - Saalfrank, Peter
T1  - Enhancement of femtosecond-laser-induced molecular desorption by thin metal films
N2  - We investigate femtosecond-laser induced desorption [desorption induced by multiple electronic transitions (DIMET)] of NO molecules from thin Pt(111) films. On the basis of a two-state, open-system density matrix treatment in combination with a two-temperature model, we argue that decreasing the film thickness enhances desorption cross sections by orders of magnitude in comparison to bulk materials. Both the spatial confinement and the laser fluence appear therefore as efficient, nonlinear enhancement factors for nonadiabatic photoreactions of metal surfaces and, possibly, of nanostructered materials in general
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Burghardt, I.
A1  - Nest, Mathias
A1  - Worth, G. A.
T1  - Multiconfigurational system-bath dynamics using Gaussian wave packets : Energy relaxation and decoherence induced by a finite-dimensional bath
Y1  - 2004
SN  - 0021-9606
ER  - 
TY  - JOUR
A1  - Burghardt, I.
A1  - Nest, Mathias
A1  - Worth, G. A.
T1  - Multiconfigurational system-bath dynamics using Gaussian wave packets : Energy relaxation and decoherence induced by a finite-dimensional bath
Y1  - 2003
SN  - 0021-9606
ER  - 
TY  - JOUR
A1  - Henkel, Carsten
A1  - Nest, Mathias
A1  - Domokos, P.
A1  - Folman, R.
T1  - Optical discrimination between spatial decoherence and thermalization of a massive object
N2  - We propose an optical ring interferometer to observe environment-induced spatial decoherence of massive objects. The object is held in a harmonic trap and scatters light between degenerate modes of a ring cavity. The output signal of the interferometer permits to monitor the spatial width of the object's wave function. It shows oscillations that arise from coherences between energy eigenstates and that reveal the difference between pure spatial decoherence and that coinciding with energy transfer and heating. Our method is designed to work with a wide variety of masses, ranging from the atomic scale to nanofabricated structures. We give a thorough discussion of its experimental feasibility
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Nest, Mathias
T1  - Quantum carpets and correlated dynamics of several fermions
N2  - We study theoretically the coherent and correlated motion of many fermions inside an infinite square well potential. We will look at electrons and He-3 atoms, which behave very differently not only because of their masses, but also because of their different interaction potential. Also, the level of theory and the role of approximations in the solution of the time-dependent Schrodinger equation will be discussed
Y1  - 2006
UR  - http://pra.aps.org/
U6  - https://doi.org/10.1103/Physreva.73.023613
ER  - 
TY  - JOUR
A1  - Saalfrank, Peter
A1  - Nest, Mathias
A1  - Andrianov, Igor V.
A1  - Klamroth, Tillmann
A1  - Kroner, Dominic
A1  - Beyvers, Stephanie
T1  - Quantum dynamics of laser-induced desorption from metal and semiconductor surfaces, and related phenomena
N2  - Recent progress towards a quantum theory of laser-induced desorption and related phenomena is reviewed, for specific examples. These comprise the photodesorption of NO from Pt(111), the scanning tunnelling microscope and laser- induced desorption and switching of H at Si(100), and the electron stimulated desorption and dissociation of CO at Ru(0001). The theoretical methods used for nuclear dynamics range from open-system density matrix theory over nonadiabatically coupled multi-state models to electron-nuclear wavepackets. Also, aspects of time-dependent spectroscopy to probe ultrafast nonadiabatic processes at surfaces will be considered for the example of two-photon photoemission of solvated electrons in ice layers on Cu(111)
Y1  - 2006
UR  - http://iopscience.iop.org/0953-8984/18/30/S05/pdf/0953-8984_18_30_S05.pdf
U6  - https://doi.org/10.1088/0953-8984/18/30/S05
SN  - 1361-648X
SN  - 0953-8984
VL  - 18
IS  - 30
SP  - S1425
EP  - S1459
PB  - IOP Publ.
CY  - Bristol
ER  -