Pressure broadening of the sodium $3s$ - $3p$ resonance lines by helium atoms.Pressure broadening of the sodium $3s$-$3p$ resonance lines by helium atoms.

Cheng Zhu, J. F. Babb, A. Dalgarno

Bulletin of the American Physical SocietyMay 19, 20050 citations

Atom Tunneling Phenomena in Quantum Solid and Liquid Helium

Yusuke Miura

Springer series on atomic, optical, and plasma physicsJan 1, 20040 citations

Pressure shift and broadening of the resonance line of barium atoms in liquid helium

S. I. Kanorsky, Markus Arndt, R. Dziewior +2 more

We have measured the pressure broadening and shift of the excitation and emission lines of the 6 ${\mathit{s}}^{2}$ $^{1}$ ${\mathit{S}}_{0}$ \ensuremath{\rightarrow}6s6p $^{1}$ ${\mathit{P}}_{1}$ transition of Ba atoms implanted in liquid and solid helium at 1.5 K. The observed spectra are quantitatively explained within the adiabatic line-broadening theory by assuming a bubble structure of the trapping sites for the Ba atoms. The evolution of the bubble shape and size in the optical excitation-deexcitation cycle is modeled theoretically.We have measured the pressure broadening and shift of the excitation and emission lines of the 6${\mathit{s}}^{2}$ $^{1}$${\mathit{S}}_{0}$\ensuremath{\rightarrow}6s6p $^{1}$${\mathit{P}}_{1}$ transition of Ba atoms implanted in liquid and solid helium at 1.5 K. The observed spectra are quantitatively explained within the adiabatic line-broadening theory by assuming a bubble structure of the trapping sites for the Ba atoms. The evolution of the bubble shape and size in the optical excitation-deexcitation cycle is modeled theoretically.

Physical review. B, Condensed matterSep 1, 199474 citations

Pressure shift of atomic resonance lines in liquid and

S. I. Kanorsky, Antoine Weis, Markus Arndt +2 more

We show that for atoms trapped in a liquid He matrix the excitation and emission spectra can be quantit- atively described by the bubble model which treats the matrix as an incompressible continuous medium. Com- parison with experimental results shows that the model also holds for a solid matrix. The model is only valid in the case where the attractive He-He interaction dominates the attractive part of the foreign atom-helium interaction. Its failure in the case of implanted Na atoms is discussed.We show that for atoms trapped in a liquid He matrix the excitation and emission spectra can be quantit- atively described by the bubble model which treats the matrix as an incompressible continuous medium. Com- parison with experimental results shows that the model also holds for a solid matrix. The model is only valid in the case where the attractive He-He interaction dominates the attractive part of the foreign atom-helium interaction. Its failure in the case of implanted Na atoms is discussed.

Jan 1, 19950 citations

Optical properties of alkali-metal atoms in pressurized liquid helium

Toshiya Kinoshita, K. Fukuda, Yoshiro Takahashi +1 more

The excitation and emission spectra of alkali-metal atoms (Cs and Rb) in liquid helium are studied. The helium pressure is changed from the saturated vapor pressure to about 25 atm at 1.6 K, under which conditions the liquid helium is in a superfluid state. The pressure shift and broadening of the observed spectra corresponding to the D lines are explained qualitatively by a theoretical calculation based on the spherical atomic bubble model. The Cs ${\mathit{D}}_{2}$ excitation spectra are found to have double peaks, indicating the existence of anisotropic oscillations of the bubble surface. The disappearance of the ${\mathit{D}}_{2}$ emission lines and the pressure-dependent quenching of the Rb ${\mathit{D}}_{1}$ emission lines are also discussed.The excitation and emission spectra of alkali-metal atoms (Cs and Rb) in liquid helium are studied. The helium pressure is changed from the saturated vapor pressure to about 25 atm at 1.6 K, under which conditions the liquid helium is in a superfluid state. The pressure shift and broadening of the observed spectra corresponding to the D lines are explained qualitatively by a theoretical calculation based on the spherical atomic bubble model. The Cs ${\mathit{D}}_{2}$ excitation spectra are found to have double peaks, indicating the existence of anisotropic oscillations of the bubble surface. The disappearance of the ${\mathit{D}}_{2}$ emission lines and the pressure-dependent quenching of the Rb ${\mathit{D}}_{1}$ emission lines are also discussed.

Physical Review AOct 1, 199571 citations

Pressure broadening of the sodium

3s

3p

resonance lines by helium atoms.

We have measured the pressure broadening and shift of the excitation and emission lines of the 6

{\mathit{s}}^{2}

^{1}

{\mathit{S}}_{0}

\ensuremath{\rightarrow}6s6p

^{1}

{\mathit{P}}_{1}

transition of Ba atoms implanted in liquid and solid helium at 1.5 K. The observed spectra are quantitatively explained within the adiabatic line-broadening theory by assuming a bubble structure of the trapping sites for the Ba atoms. The evolution of the bubble shape and size in the optical excitation-deexcitation cycle is modeled theoretically.

{\mathit{D}}_{2}

excitation spectra are found to have double peaks, indicating the existence of anisotropic oscillations of the bubble surface. The disappearance of the

{\mathit{D}}_{2}

emission lines and the pressure-dependent quenching of the Rb

{\mathit{D}}_{1}

emission lines are also discussed.