Bimodal velocity and size distributions of pulsed superfluid helium droplet beams

2021 ◽  
Vol 154 (13) ◽  
pp. 134303
Author(s):  
Rahul Pandey ◽  
Steven Tran ◽  
Jie Zhang ◽  
Yuzhong Yao ◽  
Wei Kong
Keyword(s):  
Superfluid Helium ◽  
Size Distributions ◽  
Helium Droplet

scholarly journals Facile time-of-flight methods for characterizing pulsed superfluid helium droplet beams

2015 ◽  
Vol 86 (8) ◽  
pp. 084102 ◽  
Author(s):  
Yunteng He ◽  
Jie Zhang ◽  
Yang Li ◽  
William M. Freund ◽  
Wei Kong
Keyword(s):  
Superfluid Helium ◽  
Time Of Flight ◽  
Helium Droplet

scholarly journals Submersion of rubidium clusters in helium nanodroplets

2021 ◽  
Vol 75 (4) ◽  
Author(s):  
Arne Schiller ◽  
Paul Martini ◽  
Elias Emile Jabbour Al Maalouf ◽  
Paul Scheier
Keyword(s):  
Experimental Studies ◽  
Cluster Ions ◽  
Size Distributions ◽  
Helium Nanodroplets ◽  
Alkali Atoms ◽  
Electron Impact Mass ◽  
Helium Droplet ◽  
Small Clusters ◽  
Sodium And Potassium ◽  
Impact Mass

Abstract Alkali atoms and small clusters are known to reside on the surface of a helium droplet rather than its inside as most other dopant species. A theoretical investigation suggested that alkali clusters (Li–Rb) exceeding a certain critical size can become submerged in the droplet, which was experimentally confirmed for sodium and potassium. Here, we report an analogous experimental study of rubidium cluster submersion by means of electron impact mass spectrometry. We recorded size distributions of Rb cluster ions at various electron energies between 8 and 160 eV. Our data suggest that Rb clusters attached to helium droplets undergo a gradual submersion transition similar to potassium, ultimately leading to the full submersion of clusters larger than $$\sim 100~\hbox {Rb}$$ ∼ 100 Rb atoms. Our findings are consistent with previous theoretical and experimental studies. Graphic abstract

scholarly journals Helium droplet infrared spectroscopy of glycine and glycine–water aggregates

2016 ◽  
Vol 18 (40) ◽  
pp. 28082-28090 ◽  
Author(s):  
Matin Kaufmann ◽  
Daniel Leicht ◽  
Raffael Schwan ◽  
Devendra Mani ◽  
Gerhard Schwaab ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Superfluid Helium ◽  
Frequency Range ◽  
Helium Nanodroplets ◽  
Helium Droplet ◽  
Infrared Absorption Spectra

Infrared absorption spectra of glycine and glycine–water aggregates embedded in superfluid helium nanodroplets were recorded in the frequency range 1000–1450 cm−1.

scholarly journals Nano-scale energetic films by superfluid helium droplet assembly

2014 ◽  
Vol 500 (5) ◽  
pp. 052012 ◽  
Author(s):  
S B Emery ◽  
J M Boyle ◽  
K B Rider ◽  
B K Little ◽  
C M Lindsay
Keyword(s):  
Superfluid Helium ◽  
Nano Scale ◽  
Helium Droplet

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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