| 释义 |
omegatron Physics.|ˈəʊmɪgətrɒn|
[f. omega (ω being the symbol of angular frequency) + -tron.]
A mass spectrometer that employs the principle of the cyclotron to identify and measure gases at very low pressures, a radio-frequency electric field being applied at right angles to a magnetic field so that charged particles having a certain charge-to-mass ratio impinge on a collecting electrode.
1949J. A. Hipple et al. in Physical Rev. LXXVI. 1878/1 Since this device measures ω, it is suggested that it be called the omegatron. 1966W. Summer tr. E. von Angerer & H. Ebert's Physical Lab. Handbk. x. 208 The omegatron..is useful as a gauge down to 10-12 torr. Ibid., The ion-collecting efficiency of an omegatron is high and operation is satisfactory in the range 10-5 to 10-9 torr. Below 10-7 torr resolution up to m = 30 is very good... Resolution is less complete for 30 ‹ m ‹ 100, but ions present can be identified. 1975Nature 6 Feb. 408/2 Partial pressures were measured with an omegatron radio-frequency mass spectrometer which formed part of the UHV section. |