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Toward Molecular Detection of Drifting Fundamental Constants
Başlık:
Toward Molecular Detection of Drifting Fundamental Constants
Yazar:
Kokish, Mark Gabriel, author.
ISBN:
9780438116115
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (155 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Advisors: Brian C. Odom; Tamar Seideman Committee members: Toru Shiozaki; Richard P. Van Duyne; Emily A. Weiss.
Özet:
Techniques in atomic physics have delivered some of the most precise measurements ever made, with frequency measurements reaching fractional precisions of 1x10--18. High precision measurements can be used to test fundamental physics, such as pursuing a variation in fundamental constants. A finite drift in measurable constants such as the proton-to-electron mass ratio (mu) would reveal physics beyond the Standard Model. Rovibrational transitions in molecules offer a way to surpass constraints on the variation of mu placed by atomic measurements.
This thesis describes the development of new techniques to measure molecules at unprecedented precision and place new constraints on the variation of mu. We work exclusively with molecular ions, which allows us to trap and interrogate molecules for long periods of time. By simultaneously trapping laser-cooled atomic ions, the molecules are cooled down to temperatures where Doppler shifts are no longer a limiting factor. We describe two different methods to address the initial challenge of producing molecular ions inside the ion trap. In the first method, we construct a molecular beam directed at trapped ions in order to produce novel molecular ions. The second method involves photoionizing molecules entrenched in a molecular beam, for which we developed a new nozzle design.
We also make further development toward achieving single molecule spectroscopy, where we aim to achieve the highest precision. We implement a method of producing our highly reactive molecule of interest, AlH+ . We also determine the optimum protocol for a new type of nondestructive, single-molecule quantum state detection, by transferring the internal state information of AlH + onto a co-trapped Ba+ ion. This state detection will ultimately be used to perform high precision spectroscopy. Lastly, we perform an in-depth analysis of the molecular characteristics necessary to provide the best constraint of mu-variation. We propose measuring TeH+, which has unique properties that allow for fast accumulation of statistics. TeH+ is also relatively insensitive to systematic frequency shifts caused by external fields, despite being polar. These new techniques and new molecules will integrate into a growing field of high precision molecular spectroscopy.
Notlar:
School code: 0163
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(691464.1) | 691464-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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