Lifetimes of ultra-long-range strontium Rydberg molecules

The lifetimes of the lower-lying vibrational states of ultra-long-range strontium Rydberg molecules comprising one ground-state 5s2 1S0 atom and one Rydberg atom in the 5s38s3S1 state are reported. The molecules are created in an ultracold gas held in an optical dipole trap and their numbers determined using field ionization, the product electrons being detected by a microchannel plate. The measurements show that, in marked contrast to earlier measurements involving rubidium Rydberg molecules, the lifetimes of the low-lying molecular vibrational states are very similar to those of the parent Rydberg atoms. This results because the strong p-wave resonance in low-energy electron-rubidium scattering, which strongly influences the rubidium molecular lifetimes, is not present for strontium. The absence of this resonance offers advantages for experiments involving strontium Rydberg atoms as impurities in quantum gases and for testing of theories of molecular formation and decay

Observed photodetachment in parallel electric and magnetic fields

We investigate photodetachment from negative ions in a homogeneous 1.0-T magnetic field and a parallel electric field of approximately 10 V/cm. A theoretical model for detachment in combined fields is presented. Calculations show that a field of 10 V/cm or more should considerably diminish the Landau structure in the detachment cross section. The ions are produced and stored in a Penning ion trap and illuminated by a single-mode dye laser. We present preliminary results for detachment from S- showing qualitative agreement with the model. Future directions of the work are also discussed.Comment: Nine pages, five figures, minor revisions showing final publicatio

Cold and Ultracold Rydberg Atoms in Strong Magnetic Fields

Cold Rydberg atoms exposed to strong magnetic fields possess unique properties which open the pathway for an intriguing many-body dynamics taking place in Rydberg gases consisting of either matter or anti-matter systems. We review both the foundations and recent developments of the field in the cold and ultracold regime where trapping and cooling of Rydberg atoms have become possible. Exotic states of moving Rydberg atoms such as giant dipole states are discussed in detail, including their formation mechanisms in a strongly magnetized cold plasma. Inhomogeneous field configurations influence the electronic structure of Rydberg atoms, and we describe the utility of corresponding effects for achieving tightly trapped ultracold Rydberg atoms. We review recent work on large, extended cold Rydberg gases in magnetic fields and their formation in strongly magnetized ultracold plasmas through collisional recombination. Implications of these results for current antihydrogen production experiments are pointed out, and techniques for trapping and cooling of such atoms are investigated.Comment: 46 pages, 38 figures, to appear in Physics Report

Cold Collisions of OH(2Π) Molecules with He Atoms in External Fields†

Contains fulltext : 75334.pdf (publisher's version ) (Closed access)11 p

Interaction of NH(X3Sigma-)with He: potential energy surface, bound states and collisional Zeeman relaxation

Contains fulltext : 32648.pdf (publisher's version ) (Open Access

Surgical management of iatrogenic occluded left pulmonary artery

A 4-year-old boy developed dyspnea 18 months after attempted surgical patent ductus arteriosus closure using a clip that was inadvertently placed on the left pulmonary artery, followed by reoperation to repair the left pulmonary artery with a patch and re-close the ductus. Computed tomography angiography confirmed a large patent ductus arteriosus, left pulmonary artery occlusion, and patent left pulmonary veins. Therefore, a third surgery was performed for suture closure of the ductus and left pulmonary artery repair with an interposition tube graft. Follow-up by transthoracic echocardiography and computed tomography angiography showed good flow in the left and right pulmonary arteries. © The Author(s) 2018

Incremental values of cardiac mechanics in systolic and diastolic heart failure in hypertrophic cardiomyopathy

Background: The early diagnosis of heart failure in patients with hypertrophic cardiomyopathy (HCM) remains a challenge. In this study, we sought to evaluate cardiac mechanics in patients with HCM. Methods: Sixty patients (60 men, mean age = 45.8 ± 17 y) with documented HCM were identified from an ongoing clinical registry. Results: The values of maximal left ventricular (LV) wall thickness, the ejection fraction (EF), global the longitudinal strain (GLS), and the global circumferential strain (GCS) were 2.2 ± 0.5 cm, 54.1 ± 6.5, �15.3 ± 4.5, and �26.9 ± 7.5, consecutively. Cardiovascular magnetic resonance imaging (CMR) data on 34 patients were included in the analysis. Nearly half of the patients had obstructive HCM; and in comparison with nonobstructive HCM, there were no significant differences in terms of GLS, GCS, EF, and the New York Heart Association Functional Class (NYHA FC). EF was similar between the 2 NYHA FC groups (I and II vs III and IV). GLS had a meaningful difference between the NYHA FC groups. In patients with a late gadolinium enhancement (LGE) value of equal to or greater than 15, EF, GLS, and GCS were correlated and reduced. Additionally, in those with an LGE value of between 5 and 15, EF was preserved with a reduced GLS. GLS was worse in patients with an E/average E� ratio of equal to or greater than 14. Conclusions: Our study showed that an increased LV wall thickness and/or a reduced LV enddiastolic volume, with better GCS, maintained a normal EF despite a reduced GLS. GLS had a better correlation with NYHA FC and LGE in CMR than EF alone. © 2020, Iranian Heart Association. All rights reserved

Observation of Rydberg blockade due to the charge-dipole interaction between an atom and a polar molecule

We demonstrate Rydberg blockade due to the charge-dipole interaction between a single Rb atom and a single RbCs molecule confined in optical tweezers. The molecule is formed by magnetoassociation of a Rb+Cs atom pair and subsequently transferred to the rovibrational ground state with an efficiency of 91(1)%. Species-specific tweezers are used to control the separation between the atom and molecule. The charge-dipole interaction causes blockade of the transition to the Rb(52s) Rydberg state, when the atom-molecule separation is set to 310(40) nm. The observed excitation dynamics are in good agreement with simulations using calculated interaction potentials. Our results open up the prospect of a hybrid platform where quantum information is transferred between individually trapped molecules using Rydberg atoms