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Consortium of Swiss Academic Libraries

Long-Distance Transport of Alkali Metals in Maturing Wheat

Zeller, S. ; Feller, U.

In: Biologia Plantarum, 2000, vol. 43, no. 4, p. 523-528

Consortium of Swiss Academic Libraries

Lifetime of the Cs 6P1/2 state in bcc and hcp solid 4He

Hofer, A. ; Moroshkin, P. ; Ulzega, S. ; Weis, A.

In: The European Physical Journal D, 2008, vol. 46, no. 1, p. 9-14

Université de Fribourg

Suppression of spin-exchange relaxation in tilted magnetic fields within the geophysical range

Scholtes, Theo ; Pustelny, Szymon ; Fritzsche, Stephan ; Schultze, Volkmar ; Stolz, Ronny ; Meyer, Hans-Georg

In: Physical Review A, 2016, vol. 94, no. 1, p. 13403

We present a detailed experimental and theoretical study on the relaxation of spin coherence due to the spin-exchange mechanism arising in the electronic ground states of alkali-metal vapor atoms. As opposed to the well-explored formation of a stretched state in a longitudinal geometry (magnetic field parallel to the laser propagation direction) we employ adapted hyperfine-selective optical...

Université de Fribourg

Spectroscopy of gold atoms isolated in liquid and solid ⁴He matrices

Moroshkin, Peter ; Lebedev, Victor ; Weis, Antoine

In: The Journal of Chemical Physics, 2013, vol. 139, no. 10, p. 104307

We present a systematic experimental study of absorption and fluorescence spectra of Au atoms in bulk liquid and solid helium matrices. The results are compared to the spectra of Cu atoms studied earlier. We investigate the dependence of the observed spectral lineshapes on the helium pressure. The observed splitting of the 5d 106p − 5d 96s 2 transitions of Au in hcp solid He gives evidence for...

Université de Fribourg

Spectroscopy of alkali-metal atoms in dense supercritical ⁴He at low temperatures

Moroshkin, Peter ; Lebedev, Victor ; Weis, Antoine

In: Physical Review A, 2013, vol. 87, no. 2, p. 022513

We present an experimental study of laser-induced fluorescence spectra of Cs atoms embedded in superfluid and solid ⁴He, as well as in dense supercritical fluid He. The studied temperature range is increased with respect to earlier studies by the use of intense laser pulses for the transient local heating of the helium sample. The analysis of the experimental spectra is based on two different...

Université de Fribourg

Spectroscopy of nonspherical atomic bubbles in solid Helium

Lebedev, Victor ; Moroshkin, Peter ; Weis, Antoine

In: The Journal of Physical Chemistry A, 2011, vol. 115, no. 25, p. 7169–7179

We analyze the effect of the host crystal symmetry on the optical spectra of the 6P1/2−6S1/2 and 6P3/2−6S1/2 transitions of atomic Cs in solid ⁴He matrices. In particular, we address the deformation of the bubble structures formed by Cs in such quantum crystals. We show that the anisotropy of the stiffness tensor leads...

Université de Fribourg

Atomic bubbles in impurity-stabilized solid ⁴He

Lebedev, Victor ; Moroshkin, Peter ; Weis, Antoine

In: Fizika Nizkikh Temperatur, 2010, vol. 35, no. 4, p. 391-395

The optical absorption and fluorescence spectra of alkali atoms isolated in liquid and solid He matrices depend on specific macroscopic matrix properties, such as their molar volume and (anisotropic) elasticity constants, and provide thus information about the quantum matrix. We have applied optical spectroscopy to investigate the properties of a recently discovered impurity-stabilized doped...