By Arthur Pehr Robert Wadlund
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Additional info for Absolute X-Ray Wave-Length Measurements
Mlynek Universitiit Konstanz, Fakultiit fUr Physik D-7750 Konstanz 1. INTRODUCTION Matter wave interferometry is a well established field in physics. Interferometers with de Broglie waves have been demonstrated for electrons! and neutrons,2 and recently also for atoms. 3 ,4 The main interest in interferometry with massive particles is due to the fact that, in contrast to light interferometry, gravitational effects can be studied and that the low particle velocity increases the interaction time in the interferometer, vastly increasing the sensitivity.
In our experiment, a fraction of the laser light was frequency shifted by modulators and then locked to an argon dc discharge. To compensate for the Doppler shift of the atomic beam, the rest of the laser light was shifted in frequency to ±720 MHz by a high frequency, high bandwidth electro-optic modulator. 3 MHz, which determines the capture range of the optical molasses. To cool all atoms of the atomic velocity distribution, special arrangements have to be used. One possibility is to increase the power density of the cooling light field.
Such wide slits would tend to reduce the visibility below that shown in Fig. 5. m). Then, by putting the atoms into the excited state with a 7r pulse from a laser beam, one should be able to see an inversion of the fringe pattern (see Fig 5). As the laser power is increased further, the original fringe pattern should return when a 27r pulse is reached. Another possible experiment would be to measure the correlation of the direction of the emitted photon with the fringe pattern of the atoms. One would find for large slit spacings that spontaneous emission would wipe out the fringe pattern.
Absolute X-Ray Wave-Length Measurements by Arthur Pehr Robert Wadlund