Photo induced collisions with laser cooled He* atoms

Mastwijk, H.C.; Rijnbach, Milou van; Thomsen, J.; Straten, P. van der; Niehaus, A.

doi:10.1007/s100530050192

Cited by 16 publications

(10 citation statements)

References 16 publications

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“…In the experiments, magneto-optically trapped samples of 3 He* or 4 He* atoms are investigated and ionization rates are measured with a micro-channel plate (mcp) detector. The measurements are performed in the absence of trapping light, as optical excitation by near-resonant light alters the dynamics of cold collisions [3,6], thereby strongly enhancing the ionization rate [7,8,9,10,11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Homonuclear ionizing collisions of laser-cooled metastable helium atoms

et al. 2006

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We present a theoretical and experimental investigation of homonuclear ionizing collisions of lasercooled metastable (2 3 S1) helium atoms, considering both the fermionic 3 He and bosonic 4 He isotope. The theoretical description combines quantum threshold behavior, Wigner's spin-conservation rule and quantum statistical symmetry requirements in a single-channel model, complementing a more complete close-coupling theory that has been reported for collisions of metastable 4 He atoms. The model is supported with measurements (in the absence of light fields) of ionization rates in magnetooptically trapped samples, that contain about 3 × 10 8 atoms of a single isotope. The ionization rates are determined from measurements of trap loss due to light-assisted collisions combined with comparative measurements of the ion production rate in the absence and presence of trapping light. Theory and experiment show good agreement.

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Section: Introductionmentioning

confidence: 99%

Homonuclear ionizing collisions of laser-cooled metastable helium atoms

et al. 2006

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“…[8,11] but is briefly reviewed here. Our He* atomic beam source is modeled after the reverse flow design of Shimizu [14] with modifications originated by Mastwijk et al [15,16]. It consists of a 1 cm diam quartz tube with a 1 mm diam tungsten needle along its axis and a 3 cm diam LN 2 -cooled stainless steel coaxial jacket.…”

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confidence: 99%

Bichromatic Slowing and Collimation to Make an Intense Helium Beam

et al. 2004

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The bichromatic force has been used to both slow and collimate a beam of metastable 2(3)S He atoms (He*). The collimation capture range is an extraordinary +/-85 m/s corresponding to approximately 0.18 radians from our source. Both slowing and collimation were accomplished in the unprecedented short distance of approximately 5 cm each. The overall brightness increase is x3200, and there is potential for considerably more.

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“…12,13 It has a slightly supersonic longitudinal velocity distribution centered near v ᐉ = 1125 m / s and is about Ϯ200 m/s wide. 12,13 It has a slightly supersonic longitudinal velocity distribution centered near v ᐉ = 1125 m / s and is about Ϯ200 m/s wide.…”

Section: Methodsmentioning

confidence: 99%

Atom lithography with metastable helium

Allred

Reeves

Corder

et al. 2010

Journal of Applied Physics

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Articles you may be interested inHigh-order optical harmonic generation as a process of single atom interaction with sub-relativistic single-and multicolor laser fields AIP Conf.A bright metastable helium ͑He ‫ء‬ ͒ beam is collimated sequentially with the bichromatic force and three optical molasses velocity compression stages. Each He ‫ء‬ atom in the beam has 20 eV of internal energy that can destroy a molecular resist assembled on a gold coated silicon wafer. Patterns in the resist are imprinted onto the gold layer with a standard selective etch. Patterning of the wafer with the He ‫ء‬ was demonstrated with two methods. First, a mesh was used to protect parts of the wafer making an array of grid lines. Second, a standing wave of = 1083 nm light was used to channel and focus the He ‫ء‬ atoms into lines separated by / 2. The patterns were measured with an atomic force microscope establishing an edge resolution of 80 nm. Our results are reliable and repeatable.

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Photo induced collisions with laser cooled He* atoms

Cited by 16 publications

References 16 publications

Homonuclear ionizing collisions of laser-cooled metastable helium atoms

Homonuclear ionizing collisions of laser-cooled metastable helium atoms

Bichromatic Slowing and Collimation to Make an Intense Helium Beam

Atom lithography with metastable helium

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