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A versatile apparatus for on-line emission channeling experiments
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic view of the EC chamber assembly (dimensions in mm): 1—ISOLDE beam-line ISO100 flange; 2—collimation block; includes: variable aperture collimator, lead shield, and laser alignment device; 3—sample implantation, annealing and measurement experimental chamber; 4—XZY sliding orientation cradle; 5—detector flanges DF30 and DF17; 6—vacuum block; 7—movable supporting frame stand with wheels and adjustable supporting pads; and 8—auxiliary control equipment panel.

Image of FIG. 2.
FIG. 2.

EC setup vertical cross section: 1—collimator chamber with lead shield, rotatable disk with collimator holes, alignment laser; 2—detector flange DF17; 3—fixed aperture removable collimator; 4—movable Faraday cup; 5—revolving thermal shield; 6—thermal shield actuator; 7—ion beam transport tube; 8—spare flange; 9—halogen lamp; 10—alignment laser mechanism; and 11—mechanical counter.

Image of FIG. 3.
FIG. 3.

EC chamber horizontal cross section: 1—lead shield and rotatable disk with collimator holes; 2—fixed aperture removable collimator; 3—fast Si pad (28 × 28 mm) electron detector block mounted on the DF17 flange; 4—spare detector flange DF30; 5—displaceable Faraday cup mechanism; and 6—cryogenic block, cryogenic shields, and cold finger.

Image of FIG. 4.
FIG. 4.

Faraday cup: 1—Faraday cup; 2—suppressor ring; 3—shield plate; and 4—Faraday alignment mechanism (translation and rotation).

Image of FIG. 5.
FIG. 5.

Beam forming collimator and laser alignment mechanism: 1—collimator chamber and lead shield; 2—beam forming diaphragm mechanism; 3—counter for positioning the variable diaphragm; 4—rotatable disk with collimator holes of various diameters; and 5—laser alignment mechanism.

Image of FIG. 6.
FIG. 6.

Collimator-2 nozzle (defines the beam spot on the sample).

Image of FIG. 7.
FIG. 7.

Non-standard removable sample holder heater: 1—heating element; 2—tantalum thermal shield; 3—stainless steel thermal shield; 4—ceramic heater base; 5—power feed; 6—ground connection; 7—back support; 8—molybdenum frontal holding plate; and 9—Panmure sample holder tube.

Image of FIG. 8.
FIG. 8.

Cryogenic block: 1—cold finger and copper braid; 2—cryostat 2nd stage (4 K); 3—cryostat 1st stage (77 K); 4—sample holder thermal shield; 5—cold path thermal shield including sliding section; and 6—cryogenic vane connected to compressor.

Image of FIG. 9.
FIG. 9.

Panmure goniometer stand: 1—goniometer; 2—goniometer mechanical actuators and counters; 3—rail-slides set for transversal displacement; 4—lifting mechanism base; 5—vertical displacement guide; 6—pneumatic actuator; 7—heavy weight compensation springs; 8—fixed cradle; 9—goniometer sample holder; and 10—EC chamber and setup.

Image of FIG. 10.
FIG. 10.

(a)–(d) Normalized experimental ß emission channeling patterns measured in the vicinity of the ⟨100⟩, ⟨111⟩, ⟨110⟩, and ⟨211⟩ directions of an ()-GaAs single crystal implanted with Mn following annealing at 100 °C. (e)–(h) Corresponding best fits of simulated patterns obtained for the combination of 70% of the Mn atoms on S sites and 28% on T sites, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A versatile apparatus for on-line emission channeling experiments