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W Jastrzebski

Publications and source records attributed to W Jastrzebski.

13 recordsLinked to original sources
PubMed2006

Experimental long range potential of the B 1Pi state in NaRb.

The long range potential of the B 1Pi state in NaRb has been investigated by observation of rovibrational levels that it supports, including the high lying ones, with the technique of polarization labeling spectroscopy. This has allowed us to characterize the potential energy curve up to 1.9 cm(-1) from the dissociation limit. The highest observed rovibrational level v=49, J=10 has the outer turning point at R=16.48 A.

Journal Article↗
PubMed2004

A regularized inverted perturbation approach method: potential energy curve of the 4 (1)Sigma(u) (+) state in Na(2).

We describe a modification of the inverted perturbation approach method allowing to construct physically sensible potential energy curves for electronic states of diatomic molecules even when some parts of the potential are not adequately characterized by the experimental data. The method is based on a simple regularization procedure, imposing an additional constraint on the constructed potential curve. In the present work it is applied to the double minimum 4 (1)Sigma(u) (+) state of Na(2), observed experimentally by polarization labeling spectroscopy technique.

Journal Article↗
PubMed2002

Collisional properties of ultracold K-Rb mixtures.

We determine the interspecies s-wave triplet scattering length a(3) for all K-Rb isotopic mixtures by measuring the elastic cross section for collisions between 41K and 87Rb in different temperature regimes. The positive value a(3)=+163(+57)(-12)a(0) ensures the stability against collapse of binary (41)K- (87)Rb Bose-Einstein condensates. For the fermion-boson mixture (40)K- (87)Rb, we obtain a large and negative scattering length which implies an efficient sympathetic cooling of the fermionic species down to the degenerate regime.

Journal Article↗
PubMed2002

Spectroscopic study of the E(4)1sigma+ state in NaLi.

Polarization labelling spectroscopy is applied to study the excited E1sigma+ state of NaLi in the energy range 26,500-28,000 cm(-1) above the bottom of the ground state. The potential curve of the E state is constructed using the Inverted Perturbation Approach method. The values of Te, omega(e) and Re are found to be 26,474.82(4), 180.3(2) cm(-1) and 3.343(1) A, respectively.

Dimerization↗
PubMed1998

The Molecular Constants and Potential Energy Curve of the Ground State X1Sigma+ in KLi.

The ground state X1Sigma+ of the diatomic molecule KLi has been studied by analyzing spectra of the B1Pi-X1Sigma+ system, simplified by polarization labeling. Rotational and vibrational constants are reported for the X1Sigma+ state covering about 45% of its potential well depth and the potential curve is constructed by the Rydberg-Klein-Rees (RKR) procedure. Comparison with previous experimental and theoretical work is made. Copyright 1998 Academic Press.

Journal Article↗