Bulletin of the American Physical Society
46th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 60, Number 7
Monday–Friday, June 8–12, 2015; Columbus, Ohio
Session P3: Focus Session: Advances in Molecular Spectroscopy and Their Applications |
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Chair: Andrei Derevianko, University of Nevada, Reno Room: Franklin AB |
Thursday, June 11, 2015 2:00PM - 2:30PM |
P3.00001: ABSTRACT WITHDRAWN |
Thursday, June 11, 2015 2:30PM - 2:42PM |
P3.00002: Decelerating and Trapping Larger Polar Molecules David Patterson Manipulating the motion of larger polyatomic molecules presents significant challenges compared to manipulation of diatomic molecules. In particular, extending Stark deceleration and electrostatic trapping to such species remains challenging. Although molecules as large as CH3F have been trapped and cooled, no general technique for trapping such molecules has been demonstrated, and cold molecules larger than 5 atoms have not been trapped. The combination of recently demonstrated continuous, high flux, slow, cold, buffer gas cooled beams of closed-shell volatile molecules, and a novel ``asymmetric stretched state'' Stark decelerator (proposed here), promise to realize a general system for decelerating and trapping samples of a broad range of volatile neutral polar prolate asymmetric top molecules; the technique is applicable to most stable molecules in the 100-500 AMU range. The trapped samples would initially be in a single rotational state, at a motional temperature of 100s of mK. Such samples would immediately allow for spectroscopy of unprecedented resolution, and straightforward extensions would allow for further cooling, direct observation of slow intra-molecular processes such as vibrational relaxation and Hz-level tunneling dynamics. Further applications include high precision tests of fundamental symmetries, such as searches for nuclear or electronic permanent electric dipole moments and predicted but not yet observed CP violation in spectra of chiral molecules. A proposed experimental design to realize trapped samples of Benzonitrile and Aminobenzonitrile is presented [Preview Abstract] |
Thursday, June 11, 2015 2:42PM - 2:54PM |
P3.00003: The high vibrational levels of the $B''\bar{B}\; {}^1\Sigma_u^+$ state of H$_2$ Alexander M. Chartrand, Wenqi Duan, Robert C. Ekey, Jr., Elizabeth F. McCormack The \emph{ungerade} $B''\bar{B}\; {}^1\Sigma_u^+$ state of H$_2$ is of interest in molecular physics due to its double-well shape that supports extremely long range, high vibrational levels converging to the third dissociation limit. The highest vibrational levels are expected to have ion-pair character and therefore follow an energy pattern that smoothly connects to the ion-pair series previously observed above the third dissociation limit. Resonantly enhanced multiphoton ionization (REMPI) spectroscopy through the $E,F$, $v = 6$ state and time of flight ion detection was used to acquire the vibrational spectrum of the $B''\bar{B}$ state over an energy range of 2000 cm$^{-1}$ leading up to the third dissociation limit. Vibrational energies inclusive of $v=51$ to $v=69$ were measured to a precision of $\sim 0.5$ cm$^{-1}$. Assignments were aided by previous measurements and theoretical predictions from the literature. The results are used to explore the ion-pair nature of these high vibrational states. [Preview Abstract] |
Thursday, June 11, 2015 2:54PM - 3:24PM |
P3.00004: Using near degeneracy of molecular levels for fundamental physics Invited Speaker: Mikhail Kozlov It is well known that close levels of opposite parity in molecules are very useful in the studies of the P-odd and P,T-odd interactions. Recent advances in experimental techniques allow to improve current limits on the P,T-odd nuclear forces in the experiments with paramagnetic molecules. Similarly, low frequency transitions can be very sensitive to the variation of the fundamental constants. In molecules we have both an accidental quasi-degeneracy of the levels of different nature and systematic symmetry induced degeneracies. The former are caused by the near cancellations of the different terms in the molecular Hamiltonian due to the fine-tuning. Enhancement in sensitivity happens if these terms of the Hamiltonian have different scalings with the fundamental constants. In linear molecules we have degenerate electronic states with non-zero projection of the electronic angular momentum $\Omega$. The non-adiabatic interactions lead to the $\Omega$-doubling, which depends on the high powers of the fundamental constants. In polyatomic molecules we have level splittings caused by the tunneling between equivalent potential minima. These splittings are very sensitive to the electron-to-proton mass ratio. When tunneling frequencies are close to the frequencies of the rotational transitions we can have accidental degeneracies and additional enhancement of sensitivity. This happens for several molecules, which are observed in interstellar medium. [Preview Abstract] |
Thursday, June 11, 2015 3:24PM - 3:36PM |
P3.00005: Observation of the NaD C1$\Sigma +$ state near the region of dissociation limit Thou-Jen Whang, Soul-En Cheng, Ming-Hong Lin, Chin-Chun Tsai Using pulsed optical-optical double resonance fluorescence depletion spectroscopy, we observed the C1$\Sigma +$ state levels of gaseous sodium deuteride molecules. In this work, total of 369 rovibrational levels were recorded including vibrational quantum numbers from 10 to 58 and rotational quantum numbers from 3 to 10. The avoid-crossing of shallow-dish well in the inner potential energy curve causes the irregular behaviors of Bv and $\Delta $Gv near the dissociation limit. A comparison of molecular properties between NaH and NaD will be presented. [Preview Abstract] |
Thursday, June 11, 2015 3:36PM - 3:48PM |
P3.00006: Photoassociation and ionization spectroscopy of ultracold $^{7}$Li-$^{85}$Rb molecules Ian Stevenson, Adeel Altaf, John Lorenz, Sourav Dutta, D.S. Elliott, Yong Chen We measured $^{7}$Li-$^{85}$Rb vibrational levels in the d$^{3}\prod $ electronic state through laser spectroscopy of ultracold molecules. In a dual species MOT, we bind pairs of ultracold atoms via photoassociation (PA). Our molecule formation rate can be as high as 3.5 x 10$^{7}$ s$^{-1}$ for the v$=$3 line of the 3(0$^{+})$ state and our PA rate coefficient, 1.3 x 10$^{-10}$ cm$^{3}$/s, is the highest among heteronuclear bi-alkali-metal molecules. These excited molecules decay to a triplet (a$^{3}\sum^{+})$ ground state; once there, they are detected using resonantly-enhanced-two-photon-ionization (RE2PI). Using known ground state vibrational levels we are able to determine the vibrational levels of the d$^{3}\prod $. [Preview Abstract] |
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