Description8(a)(b)(c) Ring of a high-field domain, made visible using the Franz-Keldysh effect.jpg
English: Fig. 8 8: Ring of a high-field domain, made visible using the Franz-Keldysh effect, circling the cathode and expanding in time 3 sec between (a), (b), and (c). Reference: K. W. Böer, H. J. Hänsch and U Kümmel, Z. für Physik 155, 170 (1959)
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