Stefan Roither
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View article: Disentangling Intracycle Interferences in Photoelectron Momentum Distributions Using Orthogonal Two-Color Laser Fields
Disentangling Intracycle Interferences in Photoelectron Momentum Distributions Using Orthogonal Two-Color Laser Fields Open
We use orthogonally polarized two-color (OTC) laser pulses to separate quantum paths in the multiphoton ionization of Ar atoms. Our OTC pulses consist of 400 and 800 nm light at a relative intensity ratio of 10∶1. We find a hitherto unobse…
View article: Localizing high-lying Rydberg wave packets with two-color laser fields
Localizing high-lying Rydberg wave packets with two-color laser fields Open
We demonstrate control over the localization of high-lying Rydberg wave\npackets in argon atoms with phase-locked orthogonally polarized two-color (OTC)\nlaser fields. With a reaction microscope, we measured ionization signals of\nhigh-lyi…
View article: Localizing High-Lying Rydberg Wave Packets with Orthogonally-Polarized Two-Color Laser Fields
Localizing High-Lying Rydberg Wave Packets with Orthogonally-Polarized Two-Color Laser Fields Open
We demonstrate controlling over the localization of high-lying Rydberg wave packets in argon atoms with orthogonally-polarized two-color laser fields. Experiments and accompanying semiclassical simulations show clear evidences on asymmetri…
View article: Fragmentation of long-lived hydrocarbons after strong field ionization
Fragmentation of long-lived hydrocarbons after strong field ionization Open
We experimentally and theoretically investigated the deprotonation process on\nnanosecond to microsecond timescale in ethylene and acetylene molecules,\nfollowing their double ionization by a strong femtosecond laser field. In our\nexperim…
View article: Slow fragmentation of hydrocarbons after ultrafast laser interaction
Slow fragmentation of hydrocarbons after ultrafast laser interaction Open
We experimentally and theoretically investigated the deprotonation process on nanosecond to microsecond timescale in ethylene and acetylene molecules, following their double ionization by a strong femtosecond laser field. In our experiment…
View article: "Slow" Molecular Fragmentation after Ultrafast Interaction
"Slow" Molecular Fragmentation after Ultrafast Interaction Open
We report experimental observation of "slow" fragmentation from ethylene molecules on nanosecond or even microsecond timescale after their interaction with femtosecond laser pulses. Our results indicate that such fragmentation process orig…
View article: Laser pulse duration can control the breakage of multiple chemical bonds
Laser pulse duration can control the breakage of multiple chemical bonds Open
We show that the interplay of electron removal and nuclear dynamics on the few femtosecond range, controlled by the duration of few-cycle laser pulses, determines the ratio of C2H43+ fragmentation into two respectively three moieties.
View article: Duration of an intense laser pulse can determine the breakage of multiple chemical bonds
Duration of an intense laser pulse can determine the breakage of multiple chemical bonds Open
Control over the breakage of a certain chemical bond in a molecule by an ultrashort laser pulse has been considered for decades. With the availability of intense non-resonant laser fields it became possible to pre-determine femtosecond to …