Please use this identifier to cite or link to this item: http://dlib.scu.ac.ir/handle/1956/5038
Title: Neutral atom and molecule focusing using a Fresnel zone plate
subject: VDP::Mathematics and natural science: 400::Physics: 430
Publisher: American Institute of Physics
Description: Errata: The turbo pump used to pump the source chamber is 3200 l/s for helium and 2200 l/s for nitrogen.
Journal Article
Focusing of neutral atoms and molecules has several potential applications. The very first microscopy images using helium as an imaging probe were published earlier this year. Another possible application is to study the diffusion of atoms and molecules through materials with high spatial resolution by stepping a porous or permeable sample across the focused beam. With this application in mind, the authors present the best resolution transmission images hitherto achieved with helium atoms less than 2 m of a thin carbon film with 2 m holes. Furthermore, they present the first experiment using a Fresnel zone plate to focus neutral molecules. They used a beam of deuterium D2 which was focused down to 15.2 0.5 m. D2 was chosen because it fits in mass to the geometry of our system, which is optimized for helium. However, the method can be extended to hydrogen H2 or other molecules by using a suitably adapted zone plate. In both cases the focus was limited by chromatic aberrations, caused by the velocity spread of the beams. Finally, they present calculations exploring the resolution limits for focusing of molecular beams using Fresnel zone plates. The calculations show that Fresnel focusing down to 170 nm full width at half maximum is possible with presently available techniques.
URI: https://bora.uib.no/handle/1956/5038
More Information: Journal of Vacuum Science and Technology B 26, 2374
http://hdl.handle.net/1956/5038
10.1116/1.2987955
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Title: Neutral atom and molecule focusing using a Fresnel zone plate
subject: VDP::Mathematics and natural science: 400::Physics: 430
Publisher: American Institute of Physics
Description: Errata: The turbo pump used to pump the source chamber is 3200 l/s for helium and 2200 l/s for nitrogen.
Journal Article
Focusing of neutral atoms and molecules has several potential applications. The very first microscopy images using helium as an imaging probe were published earlier this year. Another possible application is to study the diffusion of atoms and molecules through materials with high spatial resolution by stepping a porous or permeable sample across the focused beam. With this application in mind, the authors present the best resolution transmission images hitherto achieved with helium atoms less than 2 m of a thin carbon film with 2 m holes. Furthermore, they present the first experiment using a Fresnel zone plate to focus neutral molecules. They used a beam of deuterium D2 which was focused down to 15.2 0.5 m. D2 was chosen because it fits in mass to the geometry of our system, which is optimized for helium. However, the method can be extended to hydrogen H2 or other molecules by using a suitably adapted zone plate. In both cases the focus was limited by chromatic aberrations, caused by the velocity spread of the beams. Finally, they present calculations exploring the resolution limits for focusing of molecular beams using Fresnel zone plates. The calculations show that Fresnel focusing down to 170 nm full width at half maximum is possible with presently available techniques.
URI: https://bora.uib.no/handle/1956/5038
More Information: Journal of Vacuum Science and Technology B 26, 2374
http://hdl.handle.net/1956/5038
10.1116/1.2987955
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Title: Neutral atom and molecule focusing using a Fresnel zone plate
subject: VDP::Mathematics and natural science: 400::Physics: 430
Publisher: American Institute of Physics
Description: Errata: The turbo pump used to pump the source chamber is 3200 l/s for helium and 2200 l/s for nitrogen.
Journal Article
Focusing of neutral atoms and molecules has several potential applications. The very first microscopy images using helium as an imaging probe were published earlier this year. Another possible application is to study the diffusion of atoms and molecules through materials with high spatial resolution by stepping a porous or permeable sample across the focused beam. With this application in mind, the authors present the best resolution transmission images hitherto achieved with helium atoms less than 2 m of a thin carbon film with 2 m holes. Furthermore, they present the first experiment using a Fresnel zone plate to focus neutral molecules. They used a beam of deuterium D2 which was focused down to 15.2 0.5 m. D2 was chosen because it fits in mass to the geometry of our system, which is optimized for helium. However, the method can be extended to hydrogen H2 or other molecules by using a suitably adapted zone plate. In both cases the focus was limited by chromatic aberrations, caused by the velocity spread of the beams. Finally, they present calculations exploring the resolution limits for focusing of molecular beams using Fresnel zone plates. The calculations show that Fresnel focusing down to 170 nm full width at half maximum is possible with presently available techniques.
URI: https://bora.uib.no/handle/1956/5038
More Information: Journal of Vacuum Science and Technology B 26, 2374
http://hdl.handle.net/1956/5038
10.1116/1.2987955
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.