File:Atomic Fountain.jpg
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On Sunday, I toured the 30 ft. tall atom fountain in the bowels of Stanford... an atom interferometer that will test the equivalence principle of Einstein’s theory of general relativity…. Does everything experience the same local gravitational pull form the Earth, regardless of mass? It's the working end of Puzzle 94 From the bottom of this vertical tube, Rb85 and Rb87 atoms shoot up and then fall back by gravity in a race, like the hammer and feather on the moon, but with insane precision. Their position is only resolved by observation on their return. At apogee near the top of this photo, they are in a cloud spread over 10 centimeters of superposition. Jason Hogan and team hopes to detect differences in gravity to 15 or maybe 16 decimal places. If they see a difference, it could suggest a fifth fundamental force (beyond electromagnetism, gravity, strong and weak forces) that operates over long distances (meters to Earths). Interestingly, this work started in Steven Chu’s group (now head of the DOE) using a 10x smaller cesium fountain. And a similarly short cesium fountain is the NIST atomic clock (the primary time and frequency standard in the U.S.). |
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Author | Steve Jurvetson from Menlo Park, USA |
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This image, originally posted to Flickr, was reviewed on 1 June 2012 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date. |
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current | 00:18, 1 June 2012 | ![]() | 3,645 × 3,645 (2.68 MB) | File Upload Bot (Magnus Manske) (talk | contribs) | Transferred from Flickr by User:bomazi using flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon EOS 5D Mark II |
Exposure time | 1/250 sec (0.004) |
F-number | f/4 |
ISO speed rating | 4,000 |
Date and time of data generation | 14:21, 28 February 2010 |
Lens focal length | 24 mm |
JPEG file comment | AppleMark |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | QuickTime 7.6.3 |
File change date and time | 19:34, 2 March 2010 |
Y and C positioning | Co-sited |
Exposure Program | Aperture priority |
Exif version | 2.2 |
Date and time of digitizing | 14:21, 28 February 2010 |
Meaning of each component |
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APEX exposure bias | 0 |
Metering mode | Pattern |
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Focal plane resolution unit | inches |
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GPS tag version | 2.2.0.0 |