Post Doc position on Single ion source from laser ionization of cesium atoms (Orsay, France)

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Laboratoire Aimé Cotton, Orsay FRANCE
15 November, 2017


laboratoire Aimé Cotton Orsay 91405
Phone: +33 169352055

Preparation, manipulation and detection of single particles are major goals in physics and technology. By using a new source based on photoionization of atoms that produce a correlated ion and electron pair we aim at the full control of the space-time trajectory of the individual ions using the extra information provided by the electrons. Such full control over each single ion in a beam would offer novel opportunity for ion beam techniques such as perfect implantation, imaging or aberration correction.

An experimental setup has been built at Laboratoire Aimé Cotton for this purpose and is ready to be tested. This setup is based on a double time-of-flight spectrometer ended by two position and time sensitive detectors working in the coincidence mode. The first step will be devoted the study of the ionization of an effusive caesium beam to control the conditions of single ion production. For this purpose we will compare the field ionization of Rydberg states and the direct photoionization. The second step will be the use of the coincidence of the ion and electron pair and the arrival positions given by the detectors to obtain a deterministic ion source. At this step the absolute detection efficiency of the ions will be investigate as a function of their velocity. The third step will be to control each ion trajectory in 7D (x, y, z, vx, vy, vz, t) by using the position and time information of the correlated electron given by the fast detector based on delay-line technique.