77 research outputs found
Taking Care of You: Body, Mind, Spirit—A Unique Stress Management Program That Improves Lifestyle Behaviors
Taking Care of You: Body, Mind, Spirit is a multi-session group program developed by University of Missouri Extension that provides a unique and practical approach to helping adults better managing their stress and bounce back from life\u27s challenges while improving lifestyle behaviors. The program combines mindfulness and a variety of other research-based positive psychology concepts and strategies as well as holistic wellness concepts. As a result of the program, participants\u27 stress levels significantly decreased and health behaviors significantly improved. This is one of very few stress management programs to show significant improvements in lifestyle behaviors
Molecular ion trap-depletion spectroscopy of BaCl
We demonstrate a simple technique for molecular ion spectroscopy. BaCl
molecular ions are trapped in a linear Paul trap in the presence of a
room-temperature He buffer gas and photodissociated by driving an electronic
transition from the ground X state to the repulsive wall of the
A state. The photodissociation spectrum is recorded by monitoring the
induced trap loss of BaCl ions as a function of excitation wavelength.
Accurate molecular potentials and spectroscopic constants are determined.
Comparison of the theoretical photodissociation cross-sections with the
measurement shows excellent agreement. This study represents the first
spectroscopic data for BaCl and an important step towards the production of
ultracold ground-state molecular ions.Comment: 5 pages, 5 figure
Multichannel quantum-defect theory for ultracold atom-ion collisions
We develop an analytical model for ultracold atom-ion collisions using the
multichannel quantum-defect formalism. The model is based on the analytical
solutions of the r^-4 long-range potential and on the application of a frame
transformation between asymptotic and molecular bases. This approach allows the
description of the atom-ion interaction in the ultracold domain in terms of
three parameters only: the singlet and triplet scattering lengths, assumed to
be independent of the relative motion angular momentum, and the lead dispersion
coefficient of the asymptotic potential. We also introduce corrections to the
scattering lengths that improve the accuracy of our quantum-defect model for
higher order partial waves, a particularly important result for an accurate
description of shape and Feshbach resonances at finite temperature. The theory
is applied to the system composed of a 40Ca+ ion and a Na atom, and compared to
numerical coupled-channel calculations carried out using ab initio potentials.
For this particular system, we investigate the spectrum of bound states, the
rate of charge-transfer processes, and the collision rates in the presence of
magnetic Feshbach resonances at zero and finite temperature.Comment: 39 pages, 21 figure
Sympathetic and swap cooling of trapped ions by cold atoms in a MOT
A mixed system of cooled and trapped, ions and atoms, paves the way for ion
assisted cold chemistry and novel many body studies. Due to the different
individual trapping mechanisms, trapped atoms are significantly colder than
trapped ions, therefore in the combined system, the strong binary ionatom
interaction results in heat flow from ions to atoms. Conversely, trapped ions
can also get collisionally heated by the cold atoms, making the resulting
equilibrium between ions and atoms intriguing. Here we experimentally
demonstrate, Rubidium ions (Rb) cool in contact with magneto-optically
trapped (MOT) Rb atoms, contrary to the general expectation of ion heating for
equal ion and atom masses. The cooling mechanism is explained theoretically and
substantiated with numerical simulations. The importance of resonant charge
exchange (RCx) collisions, which allows swap cooling of ions with atoms,
wherein a single glancing collision event brings a fast ion to rest, is
discussed.Comment: 10 pages, 3 figure
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