196,436 research outputs found
r.f.-optical Double Resonance and Level Crossing Spectroscopy with Optogalvanic Detection,
No full text
Collective oscillations of two colliding bose-einstein condensates
No full textTwo
87
Rb
condensates (
F
=
2
,
m
f
=
2
, and
m
f
=
1
) are produced in highly displaced harmonic traps and the collective dynamical behavior is investigated. The mutual interaction between the two condensates is evidenced in the center-of-mass oscillations as a frequency shift of
6.4
(
3
)
%
. Calculations based on a mean-field theory well describe the observed effects of periodical collisions both on the center-of-mass motion and on the shape oscillations
Frequency-comb-assisted precision spectroscopy of a buffer-gas-cooled acetylene beam
No full textWe demonstrate continuous-wave cavity ring-down spectroscopy of a partially hydrodynamic molecular beam emerging from a buffer-gas-cooling source. Specifically, the (nu1+nu3) vibrational overtone band of acetylene (12C2H2) around 1.5 micron is accessed using a narrow-linewidth diode laser stabilized against a GPS-disciplined rubidium clock via an optical frequency comb synthesizer. As an example, the absolute frequency of the R(1) component is measured witha fractional accuracy of 1x10-9. Our approach represents the first step towards the extension of more sophisticated cavity-enhanced interrogation schemes, like two-photon excitation, to buffer-gas-cooled molecular beams. In this respect, a frequency-comb-referenced absolute calibration of the 13C12CH2 spectrum around 6497 cm-1 is also reported, preliminary to the implementation of a Doppler-free two-color interrogation scheme.References: L. santamaria, V. Di sarno, P. De Natale, M. De Rosa, M. Inguscio, S. Mosca, I. Ricciardi, D. Calonico, F. Levi, P. Maddaloni, Phys. Chem. Chem. Phys. 18, 16715 (2016)
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