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1726. Scintillation-type mass-spectrometer ion detector
Classified abstracts 1725--1741 tion o f 2300 was f o u n d for these isotopes. (USSR) A V Demyanov et al, Pribory Tekh Eksp, 11 (2), Mar-Apr 1966, 28-33
(in Russian). 22 1725. Thermogauge for measuring pressures of 1-100 torr. (USSR) I n the usual glass balloon a Pt filament of diameter 0,05 m m is heated to a t e m p e r a t u r e far higher t h a n the usual Pirani gauge. T h e filament t e m p e r a t u r e is kept c o n s t a n t by m e a n s of AgS photocell a n d filament c u r r e n t is measured. Sensitivity o f this gauge in pressure range 1-20 torr is a b o u t 0,5 m A torr -a a n d the c u r r e n t for 760 torr is a b o u t 1 A. Calibrating curves for air, H2, O~, N~ a n d A r are given. Only in He a t m o s p h e r e , the filament cracked for u n k n o w n causes. T h e s a m e effect was obscrved with W filaments with diameters 0.02 a n d 0.04 ram. ( USSR) B B Bolotov and L P Strakhov, Pribory Tekh Eksp, 11 (2), Mar-Apt
1966, 116-119 (in Russian). 22 1726. Scintillation-type mass-spectrometer ion detector. (USSR) A new detection c h a m b e r was designed. T h e m a s s - s p e c t r o m e t e r T y p e MS-4. W i t h o u t an auxiliary electrostatic field in this c h a m b e r , ions travel to the usual collector a n d the u s u a l amplifier is used for recording current peaks. But with a n auxiliary voltage of 14 kV the ion b e a m bends, falls on the emitter a n d excites electrons. Coefficient o f this secondary emission is 1 or better. D u e to the same auxiliary electrostatic field, these electrons travel to the scintillation detector a n d excite p h o t o n s a n d outside the c h a m b e r is the usual p h o t o electron multiplier tube. By this m e a n s the m a s s - s p e c t r o m e t e r has its sensitivity improved a b o u t 3000 times, currents larger t h a n 10 -13 A do n o t affect the sensitivity o f the scintillation detector a n d this detector m a y be calibrated by c o m p a r i s o n with the ion collector signal. (USSR) A M Kolehin and B J a Kolesnikov, Pribory Tekh Eksp, 11 (2), Mar-
Apr 1966, 99-101 (in Russian). 22 1727. Ghost peaks in omegatron-obtained mass spectra. (USSR) T h e causes of the appearance of peaks in the m a s s spectra o f the o m e g a t r o n at frequencies that are multiples o f the r e s o n a n t frequency are examined. M e t h o d s of identifying a n d eliminating g h o s t peaks are given. (Author) A P Averina, lnstrum Exp Tech, Apr 1966, 1201 (Translfrom Pribory
i Tekh Eksp, No 5, Sept~Oct 1965). 22 1728. The inertia of thermoelectric manometric converters. (USSR) T h e results of a theoretical study of the dependence o f the response speed of thermoelectric m a n o m e t r i c converters u p o n their design parameters a n d v a c u u m a n d also u p o n the connection conditions are discussed. (Author) A A Birshert. hlstrum Exp Tech, Apr 1966, 1210 (Translfrom Pribor.v
i Tekh Eksp, No 5, Sept/Oct 1965). 22 1729. An ionization gauge for measuring pressure under eonstant and pulse conditions. (USSR) A n ionization gauge built on the basis of 2S3A u l t r a m i n i a t u r e triodes for m e a s u r i n g the pressure o f inert gases in the range o f 10 -a to 1 torr is described. T h e gauge permits b o t h c o n s t a n t a n d timevariable pressure to be measured. (Authors) A S Voznyuk et al, Instrum Exp Tech, Apr 1966, 1215 (Translfrom
Pribory i Tekh Eksp, No 5, Sept/Oct 1965). 22 1730. A pulse ionization gauge. (USSR) A pulse ionization gauge with a n oxide c a t h o d e for m e a s u r i n g the pressure of chemically inert gases to 1 tort is described. (Authors) V P Goneharenko and A S Slavnyi, Instrum Exp Tech, Apr 1966,
1278 (Transl from Pribory i Tekh Eksp, No 5, Sept~Oct 1965). 22 1731. Extension of range of thermoeouple manometers. (USSR) T h e r a n g e o f t h e r m o c o u p l e m a n o m e t e r s is extended by utilizing sensors filled with dispersed thermally insulating materials. (Author) V M Kostylev, Instrum Exp Tech, Apr 1966, 1276 (Transl fi'om
Pribory i Tekh Eksp, No 5, Sept/Oct 1965). 23. P l u m b i n g 23 1732. A simple vacuum leadthrough seal. (Great Britain) A seal is described which is extremely c o m p a c t a n d can be m a d e
w i t h o u t accurate machining, b u t which has a leak rate less t h a n 10/xl torr/sec. A practical seal of this type is described which h a s been in use for more t h a n three m o n t h s . P A B Toombs, J Sci Instrum, 43, (5), 1966, 329-330. 23 1733. A simple technique for sealing molybdenum to Pyrex glass tubing. (Great Britain) T h e M o disk a n d Pyrex glass tubing are platinized a n d sealed together with the help o f AgCI. T h e seal thus f o r m e d is bakeable a n d v a c u u m tight. M Aslam, J Sci Instrum, 43 (5), 1966, 343 344. 23 1734. A new versatile vacuum quick-seal and vacuum lock. (USA) A n all metal quick seal was developed to work with microwaves. The m e t h o d a n d sequence o f assembly are described. O D Matlock, Oak Rid~,e National Laboratory, Tennessee, 1965, 8
pages. 23 1735. Method for sealing off ceramic crucibles. (Germany) It is d e m o n s t r a t e d that ceramic crucibles c a n be sealed off with oxyh y d r o g e n blow pipes by a simple technique. Entry o f air a n d c o m b u s tion is prevented by this technique. Some applications o f the v a c u u m tight a m p o u l e s are given. H Klotz, Vaknum-Teehnik, 15, 1966, 6346 (in German). 23 1736. Glass vacuum seal to operate at high temperatures. (USA) Description o f device s h o w n to be satisfactory to the p r o b l e m s e n c o u n t e r e d in designing a h o t inlet system. R M Tester and W R Doty, Rev Sci lnstrum, 37, 1966, 792-793. 23 1737. High-vacuum seal for low temperatures. (USSR) A h i g h - v a c u u m teflon seal that is usable in t e m p e r a t u r e r a n g e 1.5500°K with a n y t h e r m a l duty cycle is described. Pressures obtained in the a p p a r a t u s with this seal were 10-5-10 -6 tort. (USSR) D N Astrov and L B Belyanskii, Pribory Tekh Eksp, 11 (2), Mar-Apr
1966, 226 227 (in Russian). 23 : 41 : 43 1738. Materials for demountable metal joints in ultrahigh-vacuum systems. (Czechoslovakia) Sealing materials used in u l t r a h i g h - v a c u u m joints s h o u l d have the following characteristics: low v a p o u r pressure, ease o f degassing, h i g h corrosion resistance, g o o d malleability, sufficiently high melting point a n d suitable thermal e x p a n s i o n coefficient. Metals which meet these requirements in varying degree are listed as gold (used in gold wire seals), silver, copper, a l u m i n i u m , indium. Siliconized rubber ' B u n a N ' , fluorelastomer 'Viton' a n d 'Silastic" are suitable hight e m p e r a t u r e plastics. T h e properties of these materials a n d the types of seals in which they are used are discussed in s o m e detail. W Espe, Slaboproudy Obzor, 1965, 26 (6), 335-342 (in Czech).
24. V a l v e s 24 1739. A greaseless vacuum valve. (Great Britain) A description is given of a valve designed to regulate the flow of gases, v a p o u r s a n d liquids, initially at a t m o s p h e r i c pressure or below, into evacuated systems. U s e d as a n isolation valve, the device can replace conventional m e r c u r y cut-offs for m a n y applications. Control m a y be m a n u a l or automatic. M A Hooker and D H T Spencer, J Sci btstrum, 43 (5), 1966, 339-340. 24 1740. Gas sampling and injection valve for vacuum service. (USA) A g a s - c h r o m a t o g r a p h y c o l u m n introduction valve is described that is capable of leak-free operation with collection v o l u m e pressure o f 10 -~ torr, low internal pressure drops a n d leak-free carrier gas circuit, does not expose sample to a t m o s p h e r e during switching, a n d does n o t c o n t a m i n a t e the sample. M Alperstein and R L Bradow, Anal Chem, 38 (2), 1966, 366-367. 24 1741. A versatile and cheap vacuum leak. (Great Britain) A versatile v a c u u m leak was developed for use with light gases. Leak rates in the range 10 -11 to 10 -~ std ml/sec were used, b u t greater variations are readily attainable in principle. T h e leak rate is p r o p o r tional to the applied gas pressure a n d leak area, a n d the leak c a n be operated conveniently at r o o m temperature. P M S Jones et al, AERE, Ahlermaston, Feb 1966, 19 pages.
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(in Russian). 22 1725. Thermogauge for measuring pressures of 1-100 torr. (USSR) I n the usual glass balloon a Pt filament of diameter 0,05 m m is heated to a t e m p e r a t u r e far higher t h a n the usual Pirani gauge. T h e filament t e m p e r a t u r e is kept c o n s t a n t by m e a n s of AgS photocell a n d filament c u r r e n t is measured. Sensitivity o f this gauge in pressure range 1-20 torr is a b o u t 0,5 m A torr -a a n d the c u r r e n t for 760 torr is a b o u t 1 A. Calibrating curves for air, H2, O~, N~ a n d A r are given. Only in He a t m o s p h e r e , the filament cracked for u n k n o w n causes. T h e s a m e effect was obscrved with W filaments with diameters 0.02 a n d 0.04 ram. ( USSR) B B Bolotov and L P Strakhov, Pribory Tekh Eksp, 11 (2), Mar-Apt
1966, 116-119 (in Russian). 22 1726. Scintillation-type mass-spectrometer ion detector. (USSR) A new detection c h a m b e r was designed. T h e m a s s - s p e c t r o m e t e r T y p e MS-4. W i t h o u t an auxiliary electrostatic field in this c h a m b e r , ions travel to the usual collector a n d the u s u a l amplifier is used for recording current peaks. But with a n auxiliary voltage of 14 kV the ion b e a m bends, falls on the emitter a n d excites electrons. Coefficient o f this secondary emission is 1 or better. D u e to the same auxiliary electrostatic field, these electrons travel to the scintillation detector a n d excite p h o t o n s a n d outside the c h a m b e r is the usual p h o t o electron multiplier tube. By this m e a n s the m a s s - s p e c t r o m e t e r has its sensitivity improved a b o u t 3000 times, currents larger t h a n 10 -13 A do n o t affect the sensitivity o f the scintillation detector a n d this detector m a y be calibrated by c o m p a r i s o n with the ion collector signal. (USSR) A M Kolehin and B J a Kolesnikov, Pribory Tekh Eksp, 11 (2), Mar-
Apr 1966, 99-101 (in Russian). 22 1727. Ghost peaks in omegatron-obtained mass spectra. (USSR) T h e causes of the appearance of peaks in the m a s s spectra o f the o m e g a t r o n at frequencies that are multiples o f the r e s o n a n t frequency are examined. M e t h o d s of identifying a n d eliminating g h o s t peaks are given. (Author) A P Averina, lnstrum Exp Tech, Apr 1966, 1201 (Translfrom Pribory
i Tekh Eksp, No 5, Sept~Oct 1965). 22 1728. The inertia of thermoelectric manometric converters. (USSR) T h e results of a theoretical study of the dependence o f the response speed of thermoelectric m a n o m e t r i c converters u p o n their design parameters a n d v a c u u m a n d also u p o n the connection conditions are discussed. (Author) A A Birshert. hlstrum Exp Tech, Apr 1966, 1210 (Translfrom Pribor.v
i Tekh Eksp, No 5, Sept/Oct 1965). 22 1729. An ionization gauge for measuring pressure under eonstant and pulse conditions. (USSR) A n ionization gauge built on the basis of 2S3A u l t r a m i n i a t u r e triodes for m e a s u r i n g the pressure o f inert gases in the range o f 10 -a to 1 torr is described. T h e gauge permits b o t h c o n s t a n t a n d timevariable pressure to be measured. (Authors) A S Voznyuk et al, Instrum Exp Tech, Apr 1966, 1215 (Translfrom
Pribory i Tekh Eksp, No 5, Sept/Oct 1965). 22 1730. A pulse ionization gauge. (USSR) A pulse ionization gauge with a n oxide c a t h o d e for m e a s u r i n g the pressure of chemically inert gases to 1 tort is described. (Authors) V P Goneharenko and A S Slavnyi, Instrum Exp Tech, Apr 1966,
1278 (Transl from Pribory i Tekh Eksp, No 5, Sept~Oct 1965). 22 1731. Extension of range of thermoeouple manometers. (USSR) T h e r a n g e o f t h e r m o c o u p l e m a n o m e t e r s is extended by utilizing sensors filled with dispersed thermally insulating materials. (Author) V M Kostylev, Instrum Exp Tech, Apr 1966, 1276 (Transl fi'om
Pribory i Tekh Eksp, No 5, Sept/Oct 1965). 23. P l u m b i n g 23 1732. A simple vacuum leadthrough seal. (Great Britain) A seal is described which is extremely c o m p a c t a n d can be m a d e
w i t h o u t accurate machining, b u t which has a leak rate less t h a n 10/xl torr/sec. A practical seal of this type is described which h a s been in use for more t h a n three m o n t h s . P A B Toombs, J Sci Instrum, 43, (5), 1966, 329-330. 23 1733. A simple technique for sealing molybdenum to Pyrex glass tubing. (Great Britain) T h e M o disk a n d Pyrex glass tubing are platinized a n d sealed together with the help o f AgCI. T h e seal thus f o r m e d is bakeable a n d v a c u u m tight. M Aslam, J Sci Instrum, 43 (5), 1966, 343 344. 23 1734. A new versatile vacuum quick-seal and vacuum lock. (USA) A n all metal quick seal was developed to work with microwaves. The m e t h o d a n d sequence o f assembly are described. O D Matlock, Oak Rid~,e National Laboratory, Tennessee, 1965, 8
pages. 23 1735. Method for sealing off ceramic crucibles. (Germany) It is d e m o n s t r a t e d that ceramic crucibles c a n be sealed off with oxyh y d r o g e n blow pipes by a simple technique. Entry o f air a n d c o m b u s tion is prevented by this technique. Some applications o f the v a c u u m tight a m p o u l e s are given. H Klotz, Vaknum-Teehnik, 15, 1966, 6346 (in German). 23 1736. Glass vacuum seal to operate at high temperatures. (USA) Description o f device s h o w n to be satisfactory to the p r o b l e m s e n c o u n t e r e d in designing a h o t inlet system. R M Tester and W R Doty, Rev Sci lnstrum, 37, 1966, 792-793. 23 1737. High-vacuum seal for low temperatures. (USSR) A h i g h - v a c u u m teflon seal that is usable in t e m p e r a t u r e r a n g e 1.5500°K with a n y t h e r m a l duty cycle is described. Pressures obtained in the a p p a r a t u s with this seal were 10-5-10 -6 tort. (USSR) D N Astrov and L B Belyanskii, Pribory Tekh Eksp, 11 (2), Mar-Apr
1966, 226 227 (in Russian). 23 : 41 : 43 1738. Materials for demountable metal joints in ultrahigh-vacuum systems. (Czechoslovakia) Sealing materials used in u l t r a h i g h - v a c u u m joints s h o u l d have the following characteristics: low v a p o u r pressure, ease o f degassing, h i g h corrosion resistance, g o o d malleability, sufficiently high melting point a n d suitable thermal e x p a n s i o n coefficient. Metals which meet these requirements in varying degree are listed as gold (used in gold wire seals), silver, copper, a l u m i n i u m , indium. Siliconized rubber ' B u n a N ' , fluorelastomer 'Viton' a n d 'Silastic" are suitable hight e m p e r a t u r e plastics. T h e properties of these materials a n d the types of seals in which they are used are discussed in s o m e detail. W Espe, Slaboproudy Obzor, 1965, 26 (6), 335-342 (in Czech).
24. V a l v e s 24 1739. A greaseless vacuum valve. (Great Britain) A description is given of a valve designed to regulate the flow of gases, v a p o u r s a n d liquids, initially at a t m o s p h e r i c pressure or below, into evacuated systems. U s e d as a n isolation valve, the device can replace conventional m e r c u r y cut-offs for m a n y applications. Control m a y be m a n u a l or automatic. M A Hooker and D H T Spencer, J Sci btstrum, 43 (5), 1966, 339-340. 24 1740. Gas sampling and injection valve for vacuum service. (USA) A g a s - c h r o m a t o g r a p h y c o l u m n introduction valve is described that is capable of leak-free operation with collection v o l u m e pressure o f 10 -~ torr, low internal pressure drops a n d leak-free carrier gas circuit, does not expose sample to a t m o s p h e r e during switching, a n d does n o t c o n t a m i n a t e the sample. M Alperstein and R L Bradow, Anal Chem, 38 (2), 1966, 366-367. 24 1741. A versatile and cheap vacuum leak. (Great Britain) A versatile v a c u u m leak was developed for use with light gases. Leak rates in the range 10 -11 to 10 -~ std ml/sec were used, b u t greater variations are readily attainable in principle. T h e leak rate is p r o p o r tional to the applied gas pressure a n d leak area, a n d the leak c a n be operated conveniently at r o o m temperature. P M S Jones et al, AERE, Ahlermaston, Feb 1966, 19 pages.
511