Classified abstracts 686--700
32. Nucleonics
32 : 64
687. Conference on high energy cyclotron improvement. (USA)
Edited by G H U Fnnsten, Williamsburg, College of William and
33
692. Determination of the area of emission of reflected electrons in a
scanning electron microscope. (Great Britain)
E x p e r i m e n t s s h o w t h a t in t h e case o f a 30 k V electron b e a m of
d i a m e t e r 1000 A striking a solid a l u m i n i u m target, t h e area of
e m i s s i o n o f reflected electrons h a s a d i a m e t e r of 4200 'A. This is
c o n s i d e r a b l y less t h a n expected.
R F W Pease, J Sci Instrum, 42 (3), March 1965, 158-159.
33
693. Emission electron microscopy. (Austria)
Survey o f p r e s e n t position, with special reference to i m p r o v e m e n t
in t h e a b e r r a t i o n o f a n d resolution lens.
H Diiker, Acta Phys Austriaca, 18 (2/4), 1964, 232-251, (in
Mary, 1964.
German).
32
686. Water vapour jet target for the charge changing of fast ion
beams. (USA)
A water v a p o u r jet is u s e d in t h e t e r m i n a l o f a t a n d e m V a n de
G r a a f accelerator as a s t r i p p i n g m e d i u m . T h e jet c o n v e r t s negative
ions into positive i o n s with a n efficiency 90 per cent. A t a b e a m
e n e r g y o f 2 MeV, t h e m a x i m u m p r o t o n c u r r e n t was 180 tzA.
( USA )
M Roos, Rev Sei Instrum, 36 (4), April 1965, 544-546.
32 : 54
688. Linear accelerator radiotherapy machine.
Anon, Engineer, 219 (5699), April 1965, p 689.
(Great Britain)
33. General physics and electronics
33
On the importance of the polarization energy in inelastic ion - molecule collisions. See a b s t r a c t n u m b e r 6 ! 6.
33
Impurity distribution in epitaxial growth. See a b s t r a c t n u m b e r 617.
33
Barium migration on the surface of tungsten, molybdenum and
rhenium in the presence of an adsorbed film of gas. See a b s t r a c t
n u m b e r 624.
33
The epitaxial growth of selenium. See a b s t r a c t n u m b e r 625.
33
Modified significant structure theory of physical adsorption. See
a b s t r a c t n u m b e r 627.
33
Electrical breakdown in vacuum: new experimental and theoretical
observations. See a b s t r a c t n u m b e r 631.
33
Study by X-ray diffractions of thin layers of lanthanum fluoride. See
a b s t r a c t n u m b e r 642.
33
Hall-effect studies in deposited CdS thin films. See a b s t r a c t n u m b e r
674.
33
Diffusion of impurities during epitaxy. See a b s t r a c t n u m b e r 683.
33
Electron beam welding machine. See a b s t r a c t n u m b e r 712.
33 : 41
689. Secondary electron emission from thin MgO film. (USSR)
M g O films d e p o s i t e d o n a n a l u m i n i u m oxide s u b s t r a t e h a d secondary electron e m i s s i o n ~max = 3.8, t h e accelerating voltage being
2.2 K e V a n d t h e a m b i e n t p r e s s u r e 1 × 10 9 torr. T h e s a m e film
d e p o s i t e d o n a fine c o p p e r m e s h h a d a ~,naz value of d o u b l e this
a m o u n t . Evidently t h e film s t r u c t u r e is m o r e f a v o u r a b l e to second a r y e m i s s i o n in t h e latter case. A r e d u c t i o n in ~ after c o n t a c t o f
t h e film with dry air was n o t e d ; t h e actual a m o u n t d e p e n d i n g o n
t h e initial ratio o f free M g in t h e M g O a n d the l e n g t h o f e x p o s u r e
time.
M T P a k h o m o v , Radio Eng & Electronics, 10 (3), 1965, 530, (in
Russian).
33 : 22
690. A pieozoelectric vacuum vibrator as a source of ions in a mass
spectrometer. (Great Britain)
T h e nickel electrodes in a v a c u u m v i b r a t o r ion s o u r c e were vibrated
by a piezoelectric crystal o f lead zirconate-titanate. I o n c u r r e n t s o f
t h e o r d e r o f 3 × 10 -9 A were o b t a i n e d a n d n o electrical noise was
observed. (Great Britain)
R J Conzemius and H J Svee, J Sci lnstrum, 42 (3), March 1965,
136-139.
33
691. Transmission electron microscope resolving power. (Germany)
T h e limiting r e s o l u t i o n for line gratings is calculated f r o m t h e
coefficients o f spherical a n d c h r o m e t i c a b e r r a t i o n , expressed in
t e r m s o f t h e significant p a r a m e t e r s o f its i m a g i n g s y s t e m . N u m e r i c a l
v a l u e for a single field c o n d e n s o r objective are given. (Germany)
E R u s k a , Optik, 22 (4), 1964, 319-349, (in German).
33
694. O n the oscillator strength determined from electron seattering
by molecules. (USA)
R A Mapleton, J Chem Phys, 42 (5), March 1965, 1846-1847.
33 : 56
695. Scanning electron microscope for inspection of semi-conductor
microcircuits. (Great Britain)
Anon, Engineer. 219 (5694), March 1965, 492-495.
35. Impregnation and potting
35
696. Vacuum impregnation plant. (Great Britain)
Anon, Nuclear Engineering, 10 (107), April 1965, p 162.
36. Drying, degassing and concentration
36
Should vacuum degassing pumps be more powerful? See a b s t r a c t
n u m b e r 653.
36
High temperature vacuum lubricant. See a b s t r a c t n u m b e r 710.
36:42
697. Out gases evolved from ceramics in vacuum at room temperature.
(Japan)
T h e ceramics were b a k e d in v a c u u m at 4 0 0 ° C for 2 h o u r s a n d s u b s e q u e n t g a s e v o l u t i o n at r o o m t e m p e r a t u r e was s t u d i e d with a m a s s
spectrometer. T h e a r g o n e v o l u t i o n f r o m v a r i o u s ceramics was
f o u n d to decrease in the o r d e r - - b a k e d talc > steatite > forstenite
a l u m i n i u m ceramic. T h e actual a m o u n t o f g a s evolved varied
f r o m s a m p l e to sample, a v e r a g i n g 8 × 10 6 cc t o r r / g for a s t o r a g e
t i m e o f 50 days, with a time c o n s t a n t for a r g o n e v o l u t i o n o f a b o u t
9 days. (Japan)
S Y a m a m o t o et al, Mass Sepectrosc, 12, Oct 1964, 89-92, (in
Japanese).
36
698. Flash freezing. (Great Britain)
Anon, Engineer, 219 (5693), March 1965, p 457.
36
699. Vacuum degassing trials. (Great Britain)
Anon, Engineer, 219 (5688), Jan 1965, p 233.
37. Metallurgy, inorganic chemistry, analytical
chemistry
37
Investigation of the rate of evaporation of heat resisting alloys in a
vacuum. See abstract n u m b e r 675.
37
Mass spectrum of yttrium chloride vapour. See a b s t r a c t n u m b e r 709.
37 : 41
700. Plant for high-purity alloys and for flame plating. (Great
Britain)
T h e first pair of the article describes a v a c u u m i n d u c t i o n f u r n a c e
i n t e n d e d for the p r o d u c t i o n o f very h i g h purity alloys. It h a s a
capacity o f 1500 lb a n d operates at a p r e s s u r e o f 1 m i c r o n . T h e
p o w e r s u p p l y is 800 V, 1500 c/s with a m a x i m u m c u r r e n t of 300 A.
In a d d i t i o n to the i n d u c t i o n coil, there is a l o w - f r e q u e n c y stirring
coil energised at 50 c/s. T h e v a c u u m s y s t e m consists o f a n R V 4 6
L e y b o l d R o o t s - t y p e p u m p t o g e t h e r with two S.180 L e y b o l d
r o t a r y p u m p s to p i o v i d e t h e v a c u u m " r o u g h i n g " ; t h e s e have a
p u m p i n g speed o f 970 l/sec. T h e fine-side s y s t e m h a s two E d w a r d s
385