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Title:Welcome To Rydberg-land
Author(s):Field, Robert W
Contributor(s):Barnum, Timothy J.; Klein, Ethan; Colombo, Tony; Grimes, David; Zhou, Yan
Abstract:Rydberg-Rydberg electronic transitions provide information about the electronic structure of the ion-core and each of the fundamental mechanisms by which a light electron exchanges energy and angular momentum with heavy nuclei. Normally, Rydberg electronic states have been indirectly observed via a sequence of laser-excitation steps, for which detection of transitions is accomplished by either fluorescence- or ionization-based schemes. Electronic transitions of $|\Delta n^{*}|<1$ between Rydberg states (n* is the effective principal quantum number) have kilo-Debye electric dipole transition moments when $n^{*}>30$. Such enormous transition moments render Rydberg-Rydberg electronic transitions directly observable. A chirped millimeter wave pulse can simultaneously polarize a 23 GHz chunk of two-level systems. In our spectra of Ca atoms (10$^{4}$ Rydberg atoms/cm$^{3}$ in a volume of 100 cm$^{3}$), the resultant Free Induction Decay (FID) from each of these two level systems is down-converted and heterodyne detected at $<$500 kHz resolution (at 3:1 S:N in a single chirp). Willis Flygare and Brooks Pate are to be thanked! But there is more, especially for molecules! Recently, the Doyle and DeMille research groups have developed a cryogenic buffer gas cooled ablation source, our version of which produces beams of alkaline earth monohalide molecules that are $>$100x brighter and 10x slower than those produced by our Smalley type supersonic jet ablation source. Our 20 K Neon buffer gas cooled ablation source, in combination with redesign of the resonance region (300 cm$^{3}$, mm-wave radiation on-axis with the molecular beam) of our CPmmW spectrometer, has resulted in a 1000x increase in brightness of a BaF molecular beam (10$^{8}$ Rydberg molecules/cm$^{3}$ in a single quantum state) and a 10x improvement in resolution (50 kHz @ 100 GHz). When buffer gas cooled ablation sources are combined with direct detection of FID, a new domain of high resolution molecular spectroscopy begs for exploration!
Issue Date:2014-06-16
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:Field, R.W.; Barnum, T.J.; Klein, E.; Colombo, T.; Grimes, D.; Zhou, Y. WELCOME TO RYDBERG-LAND. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.MA02
Rights Information:Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License.
Date Available in IDEALS:2014-09-17

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