scholarly journals The Dependence of Measured Drift Velocity on Shutter Open Time in the Four Gauze Time-of-Flight Method

1986 ◽  
Vol 39 (2) ◽  
pp. 225 ◽  
Author(s):  
OM Williams ◽  
MT Elford
Keyword(s):  
Transit Time ◽  
Drift Velocity ◽  
Time Of Flight ◽  
Combined Effects ◽  
Drift Space ◽  
Open Time ◽  
The Asymmetry ◽  
Time Of Flight Method ◽  
Experimental Scatter

Measurements of ion transit time by the four gauze time-of-f1ight method have been shown previously to have a small dependence on the shutter open time. This effect has been investigated for the case of Kr + ions in Kr and found to be due to the combined effects of diffusion and the injection of asymmetric ion pulses into the drift space. The cause of the asymmetry and procedures for checking for the presence of an error from this source are discussed. It is estimated that the error incurred can be reduced to within the experimental scatter of the measured mobility; that is, to less than �0�15%.

scholarly journals The Drift Velocity of Electrons in Oxygen at 293 K

1973 ◽  
Vol 26 (6) ◽  
pp. 771 ◽  
Author(s):  
RW Crompton ◽  
MT Elford
Keyword(s):  
Drift Velocity ◽  
Drift Tube ◽  
Time Of Flight ◽  
Velocity Measurements ◽  
Time Of Flight Method ◽  
Good Agreement

The drift velocity of electrons in oxygen at 293 K has been measured over the range 0.8 ≤ E/N ≤ 12 Td by the Bradbury–Nielsen time-of-flight method. The factors governing the range over which measurements can be made are discussed and it is shown that long drift tubes should be used for drift velocity measurements in oxygen at low values of E/N. A 50 cm drift tube is described. The error in the present results is estimated to be less than 1 % for 1.8 E/N E/N > 6 Td and at 1.5 Td, 5 % at 1 Td, and 10 % at 0.8 Td. The present data are in good agreement with those of Fleming et al. (1972) and Nelson and Davis (1972) over the E/N range where the sets of data overlap.

scholarly journals The Drift Velocity of Electrons in Mercury Vapour at 573 K

1980 ◽  
Vol 33 (2) ◽  
pp. 239
Author(s):  
MT Elford
Keyword(s):  
Density Dependence ◽  
Drift Velocity ◽  
Time Of Flight ◽  
Mercury Vapour ◽  
Number Density ◽  
Sources Of Error ◽  
Time Of Flight Method

The drift velocity of electrons in mercury vapour at 573 K has been measured using the Bradbury-Nielsen time-of-flight method at vapour number densities ranging from 3�40x 1017 to 1�83x1018 cm-3 and at E/Nvalues from 0�1 to 3�0 Td. The measured drift velocities increase linearly with mercury vapour number density, the magnitude of the dependence being a function of E/ N. This number density dependence has been attributed to the presence of mercury dimers and the drift velocity corresponding to dimer-free mercury vapour has been obtained by extrapolation. Sources-of error are examined and the present results are compared with those of previous workers.

scholarly journals A Note on End Effects in Electron Drift Tube Experiments

1973 ◽  
Vol 26 (5) ◽  
pp. 685
Author(s):  
MT Elford ◽  
AG Robertson
Keyword(s):  
Drift Velocity ◽  
Drift Tube ◽  
Time Of Flight ◽  
Drift Chamber ◽  
Electron Drift Velocity ◽  
Electron Drift ◽  
Velocity Measurements ◽  
End Effects ◽  
Time Of Flight Method

Experiments to test the influence of end effects on electron drift velocity measurements by the Bradbury-Nielsen time-of-flight method are described. A comparison of data taken at drift distances of 5, 10, and 50 cm in hydrogen and 5 and 10 cm in helium shows that over the EIN and pressure ranges investigated the results are independent of drift distance and that it is justifiable to consider this distance as that between the mid planes of the grids which terminate the drift chamber.

Attempts to measure ion mobilities in EHD liquids by the time-of-flight method

2014 ◽  
Author(s):  
Kengo Itoh ◽  
Takashi Yamazaki ◽  
Kiyoshi Takamoto ◽  
Ryoichi Hanaoka ◽  
Yuta Katagiri ◽  
...  
Keyword(s):  
Time Of Flight ◽  
Time Of Flight Method

Study of the Ion Composition of the Diffuse Vacuum Arc on a Hot Cathode by the Time-of-Flight Method

2020 ◽  
Vol 46 (6) ◽  
pp. 611-616
Author(s):  
A. D. Melnikov ◽  
R. A. Usmanov ◽  
R. Kh. Amirov ◽  
N. N. Antonov ◽  
A. V. Gavrikov ◽  
...  
Keyword(s):  
Time Of Flight ◽  
Vacuum Arc ◽  
Ion Composition ◽  
Time Of Flight Method

Measurements of Velocity Distribution in Potassium Molecular Beams by Time-of-Flight Method

1971 ◽  
Vol 10 (5) ◽  
pp. 543-550 ◽  
Author(s):  
Kumasaburo Kodera ◽  
Isao Kusunoki ◽  
Kunihiko Horinouchi ◽  
Kimio Isa ◽  
Masahiro Yoshihara
Keyword(s):  
Velocity Distribution ◽  
Time Of Flight ◽  
Molecular Beams ◽  
Time Of Flight Method

Evaluation of penetration speed of liquids into skin using a terahertz time-of-flight method

2021 ◽  
Vol 60 (3) ◽  
pp. 032002
Author(s):  
Sota Sueda ◽  
Tomoya Niki ◽  
Kenji Sakai ◽  
Toshihiko Kiwa
Keyword(s):  
Time Of Flight ◽  
Time Of Flight Method
Sign in / Sign up

Export Citation Format

Share Document