Optical investigation of impurities in superfluid4He

Tabbert, Bernd; Günther, Harald; Putlitz, G. zu

doi:10.1007/bf02435485

Cited by 97 publications

(53 citation statements)

References 133 publications

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“…The spectral properties of atomic systems are modified considerably under external confinements [1][2][3]. Of particular interest, is the effect of a surrounding plasma of different coupling strengths Γ , defined as the ratio of average Coulomb potential energy between pairs of particles and their kinetic energy.…”

Section: Introductionmentioning

confidence: 99%

Effect of strongly coupled plasma on the spectra of hydrogenlike carbon, aluminium and argon

Bhattacharyya¹,

Sil

Fritzsche

et al. 2007

Eur. Phys. J. D

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Abstract.A detailed study has been performed for estimating the orbital energies, positions and shifts of the Lyman lines of C 5+ , Al 12+ and Ar 17+ under strongly coupled plasma with a view to understand such line positions and shifts obtained in laser produced plasma experiments. The effect of strongly coupled plasma has been treated within the Ion Sphere (IS) model. Both non-relativistic and relativistic methods have been used for estimating the spectral properties. Theoretical estimates with IS model of the plasma are in conformity with the results of laser plasma experiments on these highly stripped ions. The experimental data for the systems have also been compared with the theoretical estimates using Debye screening model of the plasma with spatial confinements which gives additional restrictions to the wave functions at finite boundaries. PACS

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Section: Introductionmentioning

confidence: 99%

Effect of strongly coupled plasma on the spectra of hydrogenlike carbon, aluminium and argon

Bhattacharyya¹,

Sil

Fritzsche

et al. 2007

Eur. Phys. J. D

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“…In recent years the analysis of the spectral properties of confined atomic systems such as those of atoms embedded in liquid helium has gained considerable momentum (Tabbert 1997) firstly, because of the availability of current implantation technique like ion beam method (Gordon 1974(Gordon , 1983(Gordon , 1993, laser sputtering and ablation technique Yabuzaki 1992;Arndt 1993;Tabbert 1994;Beijersbergen 1993;Kinoshita 1995) and secondly due to accurate methods available for estimating the spectral line shifts Tabbert 1995;Kanorski 1994). Although a host of experimental data for different atoms are currently available, very few methods exist for theoretical estimation of the spectral line shifts and other properties under such confinement.…”

Section: Introductionmentioning

confidence: 99%

Energy levels and structural properties of compressed hydrogen atom under Debye screening

Saha

Mukherjee

Diercksen

2002

A&A

138

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Abstract. Time dependent variation perturbation calculations have been performed for estimating the transition energies, oscillator strengths and transition probability values for a few dipole allowed states of compressed hydrogen atom confined in a weakly coupled plasma. The compression is obtained by embedding the atom at the centre of an impenetrable spherical box. The dipole polarizability of the atom is evaluated at each confinement radius with respect to different plasma screening parameters. The effect of pressure due to spatial confinement on the dipole polarizability and other atomic properties is analyzed. Results obtained are useful for the diagnostic determination of astrophysical and laboratory plasmas and for the calculation of collision rate coefficients needed for computing opacity of stellar envelopes -a quantity of importance in the context of stellar structure and pulsations.

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“…[1][2][3][4], and references therein). Due to electrostriction, the positive ion locally perturbs the superfluid so strongly that in most cases it is surrounded by very inhomogeneous, high density helium solvation layers [2].…”

Section: Introductionmentioning

confidence: 99%

Rotational and vibrational dynamics of CO2 and N2O in helium nanodroplets

Nauta

Miller

2001

The Journal of Chemical Physics

114

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The dynamics following the photoionization of neutral Rb and Cs atoms residing in a dimple at the surface of a superfluid 4 He 1000 nanodroplet has been investigated within time-dependent density functional theory, complementing a previous study on Ba. The calculations reveal that structured high density helium solvation layers form around both the Rb + and Cs + cation on a picosecond time scale, forming so-called snowballs. In contrast to the Rb + ion, Cs + is not solvated by the 4 He 1000 droplet but rather desorbs from it as a Cs + He n snowball. This outcome is partially related to the large size of Cs + cation in relation to the helium droplet as is revealed by calculations performed using a planar helium surface. The large droplet deformations induced by the solvation of the Rb + cation is found to lead to efficient nucleation of quantized vortex loops or rings.

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Optical investigation of impurities in superfluid4He

Cited by 97 publications

References 133 publications

Effect of strongly coupled plasma on the spectra of hydrogenlike carbon, aluminium and argon

Effect of strongly coupled plasma on the spectra of hydrogenlike carbon, aluminium and argon

Energy levels and structural properties of compressed hydrogen atom under Debye screening

Rotational and vibrational dynamics of CO2 and N2O in helium nanodroplets

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