Velocity Selection of Cluster Members with Use of Objective-Prism Plates

1975 ◽  
Vol 87 ◽  
pp. 551
Author(s):  
R. E., Jr. White ◽  
D. R. Mosley ◽  
I. Furenlid ◽  
R. E., III White
Keyword(s):  
Objective Prism ◽  
Velocity Selection ◽  
Selection Of

scholarly journals About the QSOs contained in the Cerro el Roble Survey and the density of UVX-QSOs in the SGP field

1986 ◽  
Vol 119 ◽  
pp. 49-50
Author(s):  
Luis E. Campusano
Keyword(s):  
Visual Inspection ◽  
The Other ◽  
Small Areas ◽  
The Third ◽  
Machine Selection ◽  
Objective Prism ◽  
Selection Of

A region containing the SGP, centered at α 00h 53m (1950) δ −28°03', is becoming a selected region for QSO research. Three lists of QSO candidates have been published for this field. One consists of candidates discovered visually on an objective prism plate, selected in a 25-deg2 area and with B(lim) ⋍ 20 mag (Clowes and Savage, 1983; the CS sample). The other list came from visual inspection of U and B plates (UVX stars), covering a region of 44-deg2 and with approximately the same limiting magnitude of the CS sample (Campusano and Torres, 1983; the CT sample). The third survey of QSO-candidates involved a machine selection of UVX stars (Shanks et al., 1983), whose published components correspond to two small areas of 1.6 and 8.2 deg2 with B(lim) = 19 mag (Boyle et al., 1985).

scholarly journals A Survey of Planetary Nebulae in the SMC and M31

1989 ◽  
Vol 131 ◽  
pp. 351-351
Author(s):  
N. Meyssonnier ◽  
M. Azzopardi ◽  
J. Lequeux ◽  
R. Gathier
Keyword(s):  
Emission Line ◽  
Planetary Nebulae ◽  
Wide Field ◽  
Objective Prism ◽  
Low Dispersion ◽  
Selection Of ◽  
General Method

Our general method for finding planetary nebulae (PN) is to make wide field objective-prism or objective-grating low-dispersion spectra on photographic plates, PN stand up amongst other emission-line objects either as Hα + [N II] 6548-6583 A emitters or as [O III] 50007 A emitters with faint or no continuum, higher-resolution spectroscopy is used for confirming a selection of candidates.

Velocity Selection of Atomic Beam by Laser

1995 ◽  
Vol 12 (5) ◽  
pp. 269-272 ◽  
Author(s):  
Cai Weiquan ◽  
Chen Hongxin ◽  
Li Fusheng ◽  
Shu Wei ◽  
Sun Shundi ◽  
...  
Keyword(s):  
Atomic Beam ◽  
Velocity Selection ◽  
Selection Of

Two-dimensional velocity selection of atoms

2005 ◽  
Author(s):  
E. Korsunsky ◽  
D. Kosachiov ◽  
Yu. Rozhdestvensky ◽  
L. Windholz
Keyword(s):  
Two Dimensional ◽  
Velocity Selection ◽  
Selection Of

Velocity Selection of Metastable Hydrogenic Atoms

1969 ◽  
Vol 40 (11) ◽  
pp. 1509-1509
Author(s):  
Joel I. Gersten
Keyword(s):  
Velocity Selection ◽  
Selection Of

scholarly journals Deposition by Velocity Selection of Laser Ablated Particles.

1995 ◽  
Vol 23 (5) ◽  
pp. 364-367 ◽  
Author(s):  
Tadashi SUGIHARA ◽  
Kanji KUBA
Keyword(s):  
Velocity Selection ◽  
Selection Of

A LINEAR RADIO-FREQUENCY MASS SPECTROMETER

1952 ◽  
Vol 30 (1) ◽  
pp. 1-13 ◽  
Author(s):  
P. A. Redhead
Keyword(s):  
Radio Frequency ◽  
Mass Spectrometer ◽  
Linear Accelerator ◽  
Ion Beam ◽  
Maximum Energy ◽  
Large Cross Section ◽  
Radio Frequency Field ◽  
The Individual ◽  
Velocity Selection ◽  
Selection Of

A radio-frequency mass spectrometer is described using a system of electrodes similar to a linear accelerator to obtain velocity selection of tin ions. A beam of ions is directed through a series of axial radio-frequency fields with alternate polarity, and the ion with a velocity (proportional to [Formula: see text]) such that it traverses the individual stages in approximately one-half period of the radio-frequency field, acquires maximum energy from this field. A retarding field region prevents all ions, except the ion with maximum energy, from reaching the collector. An ion beam of large cross section is used. With 20 radio-frequency stages a mass resolution of 1% is obtained.

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