Three-Dimensional Resonant Coherent Excitation of Nonchanneling Ions in a Crystal

Abstract

We have observed resonant coherent excitation (RCE) of H-like Ar(17+) ions traveling through a 1 microm-thick Si crystal at an energy of 391 MeV/u in the nonchanneling condition. A three-dimensional periodic array of atomic planes induces RCE of the nonchanneling ions. The high energy heavy ions together with the thin crystal allow us to observe this new RCE through the measurements of the charge-state distribution of the emerging ions. The observed resonances are much narrower than those of planar-channeling ions due to the absence of the large Stark shift caused by the planar potential.

Spin nutation induced by atomic motion in a magnetic lattice

“…The above discussion can be understood in terms of crystal physics [4,13]. A periodic field B(r) that is a function of position r can be expanded in a Fourier series…”

“…18 Hz [3][4][5][6], in which the order was determined by the ion velocity (∼ 10 8 m/s) and the lattice constant (∼ 10 −10 m). The principle of RCE is quite general and has recently been extended to low-energy experiments [7][8][9], with the objective of developing a new type of atomic manipulation technique, particularly near the surface.…”

Dressed Atoms in Flight through a Periodic Crystal Field: X-VUV Double Resonance

“…The crystal field consists of numerous oscillation frequency components, and when one of the frequencies matches the internal transition energy, a resonant electronic transition takes place. This unique resonance transition was predicted by Okorokov [5] and first observed by Datz et al [6], and is often called Okorokov effect or resonant coherent excitation (RCE) [5][6][7][8][9][10][11]. The RCE technique can induce resonances at high energies of several tens of keV with a strong electric field (10 10 -10 11 V=m).…”

“…We recently found three-dimensional RCE (3D-RCE) [9], where the ions in flight experience the field with the frequencies at which the periodic arrays of atomic planes pass over the ion in a crystal under the nonchanneling condition, as shown schematically in Figs. 1(a) and 1(b).…”

Polarization Control in Three-Dimensional Resonant Coherent Excitation

“…In three-dimensional resonant coherent excitation (3D-RCE), a novel type of RCE induced by a periodic array of atomic planes [9], the ions experience a linearly polarized oscillating field in the crystal. We observed the deexcitation x-ray emission from ions excited through 3D-RCE for the first time, and found a distinct angular anisotropy that depended on the polarization direction of the oscillating crystal field.…”