Excitation of rotons in parahydrogen crystals: The laser-induced-molecular-alignment mechanism

Kiljunen, Toni

doi:10.1103/physreva.88.043420

Cited by 2 publications

(2 citation statements)

References 64 publications

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“…This confinement is also reflected in the corresponding angular covariance maps (b1)-(b9), where the covariance signal changes from being a uniform line centered at θ 2 = θ 1 +180°or at θ 2 = θ 1 −180°(panel (b1)), to a confined island centered at (90°,270°), and the equivalent island at (270°,90°) (panel (b9)). It is clear from both the ion images and covariance maps that the degree of alignment increases as the alignment intensity is increased from column (1) to column (9), and that the degree of alignment appears to saturate at around column (5) -increasing the intensity beyond this level does not seem to dramatically increase the observed degree of alignment. This can be quantified by calculating cos 2 θ 2D -but it is useful to first consider the explosion process in He droplets in more detail.…”

Section: Resultsmentioning

confidence: 93%

“…This creates several new opportunities. Firstly, timeresolved imaging of molecular rotation, induced and probed by fs laser pulses makes it possible to investigate how rotational quantum coherence, angular momentum, and energy are influenced by a dissipative environment [1,3,[6][7][8][9][10][11][12]. Secondly, the 0.4 K temperature of He droplets is shared with the molecules residing inside the droplets [13].…”

Section: Introductionmentioning

confidence: 99%

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Alignment of the CS2 dimer embedded in helium droplets induced by a circularly polarized laser pulse

et al. 2019

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Dimers of carbon disulfide (CS 2 ) molecules embedded in helium nanodroplets are aligned using a moderately intense, 160 ps, non-resonant, circularly polarized laser pulse. It is shown that the intermolecular carbon-carbon (C-C) axis aligns along the axis perpendicular to the polarization plane of the alignment laser pulse. The degree of alignment, quantified by cos 2 θ 2D , is determined from the emission directions of recoiling CS + 2 fragment ions, created when an intense 40 fs probe laser pulse doubly ionizes the dimers. Here, θ 2D is the projection of the angle between the C-C axis on the 2D ion detector and the normal to the polarization plane. cos 2 θ 2D is measured as a function of the alignment laser intensity and the results agree well with cos 2 θ 2D calculated for gas-phase CS 2 dimers with a rotational temperature of 0.4 K. * henriks@chem.au.dk arXiv:1901.03184v1 [physics.chem-ph]

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Alignment of the CS2 dimer embedded in helium droplets induced by a circularly polarized laser pulse

et al. 2019

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Femtosecond optical Kerr effect setup with signal “live view” for measurements in the solid, liquid, and gas phases

Polok

Gadomski

Ratajska-Gadomska

2015

Review of Scientific Instruments

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We present the experimental setup constructed in our laboratory for measurement of the femtosecond optical Kerr effect. The setup allows measurements with high temporal resolution and acquisition speed. The high signal to noise ratio is obtained with use of a homemade balanced detector. Due to the high acquisition speed and good signal to noise ratio, it is possible to have a "live view" of the signal and to easily tune the sample position and orientation before the measurement. We show the example results obtained in the solid, liquid, and the gas phases and we use them in order to check on the precision of our setup. As the samples we have used a YAG crystal, liquid acetone, and atmospheric air. In the latter two cases, a good agreement with the literature data has been found. The measurements in the gas phase confirm that our setup, although utilizing low energy pulses from the sapphire oscillator, is able to acquire high quality rotational signal in a low density sample.

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Excitation of rotons in parahydrogen crystals: The laser-induced-molecular-alignment mechanism

Cited by 2 publications

References 64 publications

Alignment of the CS2 dimer embedded in helium droplets induced by a circularly polarized laser pulse

Alignment of the CS2 dimer embedded in helium droplets induced by a circularly polarized laser pulse

Femtosecond optical Kerr effect setup with signal “live view” for measurements in the solid, liquid, and gas phases

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