Publications (10)
Accurate determination of the scattering length of metastable Helium atoms using dark resonances between atoms and exotic molecules
S. Moal, M. Portier, J. Kim +4
We present a new measurement of the s-wave scattering length a of spin-polarized helium atoms in the 2^3S_1 metastable state. Using two-photon photoassociation spectroscopy and dar…
Frequency shifts of photoassociative spectra of ultracold metastable Helium atoms : a new measurement of the s-wave scattering length
J. Kim, S. Moal, M. Portier +3
We observe light-induced frequency shifts in one-color photoassociative spectra of magnetically trapped He atoms in the metastable state. A pair of ultracold spin-…
Prospects for measurement and control of the scattering length of metastable helium using photoassociation techniques
J. C. J. Koelemeij, M. Leduc
A numerical investigation of two-laser photoassociation (PA) spectroscopy on spin-polarized metastable helium (He*) atoms is presented within the context of experimental observatio…
Penning collisions of laser-cooled metastable helium atoms
F. Pereira Dos Santos, F. Perales, J. Leonard +6
We present experimental results on the two-body loss rates in a magneto-optical trap of metastable helium atoms. Absolute rates are measured in a systematic way for several laser d…
Bose-Einstein Condensation of Metastable Helium
F. Pereira Dos Santos, J. Leonard, Junmin Wang +6
We have observed a Bose-Einstein Condensate in a dilute gas of He in the metastable state. We find a critical temperature of K and a typical number of…
Efficient magneto-optical trapping of a metastable helium gas
F. Pereira Dos Santos, F. Perales, J. Leonard +6
This article presents a new experiment aiming at BEC of metastable helium atoms. It describes the design of a high flux discharge source of atoms and a robust laser system using a…
Giant Helium Dimers Produced by Photoassociation of Ultracold Metastable Atoms
J. Leonard, M. Walhout, A. P. Mosk +3
We produce giant helium dimers by photoassociation of metastable helium atoms in a magnetically trapped, ultracold cloud. The photoassociation laser is detuned red of the atomic $2…
Hydrodynamic modes in a trapped gas of metastable helium above the Bose-Einstein transition
M. Leduc, J. Leonard, F. Pereira dos Santos +3
This article describes experiments performed with an ultracold gas of metastable helium above the Bose-Einstein transition. The gas is trapped in an harmonic magnetic potential and…
Analysis of Photoassociation Spectra for Giant Helium Dimers
J. Leonard, A. P. Mosk, M. Walhout +3
We perform a theoretical analysis to interpret the spectra of purely long-range helium dimers produced by photoassociation (PA) in an ultra-cold gas of metastable helium atoms. The…
Rotationally induced Penning ionization of ultracold photoassociated helium dimers
J. Léonard, A. P. Mosk, M. Walhout +4
We have studied photoassociation of metastable \tripS helium atoms near the \tripS-\tripP asymptote by both ion detection in a magneto-optical trap and trap-loss measurements in a…