Ultrafast electrons in the direction of the diffraction

摘要

The invention, allows ultrafast electrons diffraction in front of the direction of the irradiation of a sample with a electrons packet in a ultrashort pulse for carrying out an ultra-fast analysis of the sample, which is able to supply electrons packets, which not only in the x - and y - direction, but also in the z - the direction (i.e, the direction of movement) in the case of the arrival at the sample are sufficiently compressed. Ultrafast electrons in the direction of the diffraction comprises: a) a laser transmitter for emitting a ultrashort laser pulse having a pulse width of not more than 1 ps in the case of an intensity of not less than 10¹⁷ W / cm² on a target of a material for the generation of electrons and b) a pulse compressor for rotating a of the target, to which the ultrashort laser pulse has been transmitted, generated electrons packet in a magnetostatic field, in order to achieve a widening of the electrons in the direction of movement of the packet to suppress. The pulse compressor has a permanent magnet on the input side with parallel surfaces, whose one end on a track of the electrons packet is arranged, and an output-side permanent magnets with parallel surfaces, which is disposed in front of and in the direction of the band with a other end of the input-side permanent magnet is connected with parallel surfaces, and the vertically with respect to the web with respect to the input-side permanent magnets with parallel surfaces is tilted