Sublevel spectroscopy of alkali atoms in superfluid helium

1995 ◽  
Vol 98 (3) ◽  
pp. 391-393 ◽  
Author(s):  
Y. Takahashi ◽  
K. Fukuda ◽  
T. Kinoshita ◽  
T. Yabuzaki
Keyword(s):  
Superfluid Helium ◽  
Alkali Atoms

Dynamics of electronically excited alkali atoms in superfluid helium

1996 ◽  
Vol 46 (S1) ◽  
pp. 359-360 ◽  
Author(s):  
Toshiya Kinoshita ◽  
Koichi Fukuda ◽  
Toru Matsuura ◽  
Tsutomu Yabuzaki
Keyword(s):  
Superfluid Helium ◽  
Alkali Atoms ◽  
Electronically Excited

scholarly journals Rydberg states of alkali atoms on superfluid helium nanodroplets: inside or outside?

2017 ◽  
Vol 19 (22) ◽  
pp. 14718-14728 ◽  
Author(s):  
Johann V. Pototschnig ◽  
Florian Lackner ◽  
Andreas W. Hauser ◽  
Wolfgang E. Ernst
Keyword(s):  
Density Functional Theory ◽  
Alkali Metal ◽  
Superfluid Helium ◽  
Metal Ion ◽  
Density Functional ◽  
Rydberg States ◽  
Electronic Excitations ◽  
Functional Theory ◽  
Helium Nanodroplets ◽  
Alkali Atoms

Electronic excitations of an electron bound to an alkali metal ion inside a droplet of superfluid 4He are computed via a combination of helium density functional theory and the numerical integration of the Schrödinger equation for a single electron in a modified, He density dependent atomic pseudopotential.

Laser spectroscopy and optical pumping of alkali atoms in superfluid helium

1995 ◽  
Vol 98 (3) ◽  
pp. 367-369 ◽  
Author(s):  
T. Yabuzaki ◽  
T. Kinoshita ◽  
K. Fukuda ◽  
Y. Takahashi
Keyword(s):  
Laser Spectroscopy ◽  
Superfluid Helium ◽  
Optical Pumping ◽  
Alkali Atoms

Spectroscopy of alkali atoms and molecules in superfluid helium

1993 ◽  
Vol 71 (7) ◽  
pp. 1035-1038 ◽  
Author(s):  
Y. Takahashi ◽  
K. Sano ◽  
T. Kinoshita ◽  
T. Yabuzaki
Keyword(s):  
Superfluid Helium ◽  
Atoms And Molecules ◽  
Alkali Atoms

High-Resolution Cryo-Electron Microscopy of Biological Macromolecules

1990 ◽  
Vol 48 (1) ◽  
pp. 126-127
Author(s):  
Yoshinori Fujiyoshi
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Diffraction Pattern ◽  
Superfluid Helium ◽  
Copper Phthalocyanine ◽  
Optical Diffraction ◽  
Irradiation Damage ◽  
Biological Macromolecules ◽  
Cross Sectional ◽  
Instrumental Resolution

The resolution of direct images of biological macromolecules is normally restricted to far less than 0.3 nm. This is not due instrumental resolution, but irradiation damage. The damage to biological macromolecules may expect to be reduced when they are cooled to a very low temperature. We started to develop a new cryo-stage for a high resolution electron microscopy in 1983, and successfully constructed a superfluid helium stage for a 400 kV microscope by 1986, whereby chlorinated copper-phthalocyanine could be photographed to a resolution of 0.26 nm at a stage temperature of 1.5 K. We are continuing to develop the cryo-microscope and have developed a cryo-microscope equipped with a superfluid helium stage and new cryo-transfer device.The New cryo-microscope achieves not only improved resolution but also increased operational ease. The construction of the new super-fluid helium stage is shown in Fig. 1, where the cross sectional structure is shown parallel to an electron beam path. The capacities of LN2 tank, LHe tank and the pot are 1400 ml, 1200 ml and 3 ml, respectively. Their surfaces are placed with gold to minimize thermal radiation. Consumption rates of liquid nitrogen and liquid helium are 170 ml/hour and 140 ml/hour, respectively. The working time of this stage is more than 7 hours starting from full LN2 and LHe tanks. Instrumental resolution of our cryo-stage cooled to 4.2 K was confirmed to be 0.20 nm by an optical diffraction pattern from the image of a chlorinated copper-phthalocyanine crystal. The image and the optical diffraction pattern are shown in Fig. 2 a, b, respectively.

VISCOSITY OF NORMAL AND SUPERFLUID HELIUM THREE

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-35-C6-36 ◽  
Author(s):  
J. M. Parpia ◽  
D. J. Sandiford ◽  
J. E. Berthold ◽  
J. D. Reppy
Keyword(s):  
Superfluid Helium ◽  
Helium Three
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