A collinear fast ion beam laser apparatus was constructed and tested. It will be used
on-line to the SLOW RI radioactive beam facility in RIKEN (Japan) and as in the
present experiment for precision absolute frequency measurements of astrophysically
important reference lines. In the current work we conducted absolute measurements
of spectral lines of Ar ions using parallel and antiparallel geometries. To provide
a reference for the laser wavelength iodine saturation spectroscopy was used. The
precision of this reference was enhanced by simultaneously observing the beat node
between the spectroscopy laser and the corresponding mode of a femtosecond laser
frequency comb.
When performing collinear and anticollinear measurements simultaneously for
the laser induced fluorescence, the exact relativistic formula for the transition
frequency v0 = pvcoll � vanticoll can be applied. In this geometry ion source instabilities
due to pressure and anode voltage fluctuation are minimized.
The procedure of fluorescence lineshapes fitting is discussed and the errors
in the measurements are estimated. The result is v0 = 485, 573, 619.7 � 0.3MHz
corresponding to (delta v)/v = 6 � 10?10 and is an improvement of two orders of magnitude
over the NIST published value.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2008-12-147 |
| Date | 14 January 2010 |
| Creators | Lioubimov, Vladimir |
| Contributors | Schuessler, Hans A. |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Dissertation |
| Format | application/pdf |
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