000030594 001__ 30594
000030594 005__ 20180501105702.0
000030594 0247_ $$2doi$$a10.5075/epfl-thesis-110
000030594 02471 $$2nebis$$a4375814
000030594 037__ $$aTHESIS_LIB
000030594 041__ $$afre
000030594 088__ $$a110
000030594 245__ $$aDéveloppement d'un spectromètre de masse à balayage rapide et son application à la photodésorption
000030594 260__ $$aLausanne$$bs.n.$$c1971
000030594 269__ $$a1971
000030594 300__ $$a31
000030594 336__ $$aTheses
000030594 520__ $$aA new mass spectrometer of the omegatron type has been designed and tested. This new device, which we have called the resotron, combines the extremely low permanent outgassing and pumping rates of the omegatron (less than 10-11 torr liter/sec. and 10-3 liter/sec. respectively) with a high scanning rate (typically 10 spectra/sec.) allowing the spectrum to be displayed on an oscilloscope. The sensitivity is about 10-12 torr of partial pressure and the resolving power (at 5% peak height) is about 40 at mass 40 for B = 4000 Gauss, or 70 at mass 70 for B = 12000 Gauss. In this paper, the performances of the omegatron and the resotron are compared. An original theory of the cyclotron resonance is developed. Based upon a circular motion approximation, this general treatment is applied to the case of the perturbation caused by the space charge of the beans, and for the conditions of rapid scanning over the resonance frequency. Experimental data are compared with the theoretical predictions. A brief description of the electronics is also given.
000030594 700__ $$aGenequand, Pierre
000030594 720_2 $$aBorel, Jean-Pierre$$edir.
000030594 8564_ $$s1604969$$uhttps://infoscience.epfl.ch/record/30594/files/EPFL_TH110.pdf$$yTexte intégral / Full text$$zTexte intégral / Full text
000030594 909CO $$ooai:infoscience.tind.io:30594$$pDOI2$$pDOI$$pthesis
000030594 920__ $$b1971
000030594 970__ $$a110/THESES
000030594 973__ $$aEPFL$$sPUBLISHED
000030594 980__ $$aTHESIS