Resonance Microwave Absorption in He II
نویسندگان
چکیده
منابع مشابه
Patchy intergalactic He ii absorption in HE 2347 − 4342 ⋆
We report on observations of redshifted He ii 303.8 ˚ A absorption in the high-redshift QSO HE 2347−4342 (z = 2.885, V = 16.1) with the Goddard High Resolution Spectrograph on board HST in its low resolution mode (△λ = 0.7 ˚ A). With f λ = 3.6 10 −15 erg cm −2 s −1Å −1 at the expected position of He ii 304Å absorption it is the most UV-bright high redshift QSO discovered so far. We show that th...
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We have investigated the intersubband transitions of surface state electrons (SSE) on liquid He induced by microwave radiation at temperatures from 1.1 K down to 0.01 K. Above 0.4 K, the transition linewidth is proportional to the density of He vapor atoms. This proportionality is explained well by Ando’s theory, in which the linewidth is determined by the electron vapor atom scattering. Howeve...
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A resonance-induced change in the resistivity of the surface state electrons (SSE) exposed to the microwave (MW) radiation is observed. The MW frequency corresponds to the transition energy between two lowest Rydberg energy levels. All measurements are done with electrons over liquid He in a temperature range 0.45−0.65 K, in which the electron relaxation time and the MW absorption linewidth are...
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ژورنال
عنوان ژورنال: Journal of Low Temperature Physics
سال: 2007
ISSN: 0022-2291,1573-7357
DOI: 10.1007/s10909-007-9529-0