We report on the observation of ultralong range interactions in a gas cold rubidium Rydberg atoms. The van der Waals interaction between pair atoms separated as far 100 000 Bohr radii features two important effects: spectral broadening resonance lines and suppression excitation with increasing density. density dependence these effects is investigated detail for $S$- $P$-Rydberg states principal quantum numbers $\mathsf{n}\ensuremath{\sim}60$ $\mathsf{n}\ensuremath{\sim}80$ excited by...

Microwave spectroscopy was used to probe the superfluid-Mott insulator transition of a Bose-Einstein condensate in three-dimensional optical lattice. By using density-dependent frequency shifts, we were able spectroscopically distinguish sites with different occupation numbers and directly image from one five, revealing shell structure Mott phase. We this determine onsite interaction lifetime for individual shells.

We report the observation of translationally ultracold heteronuclear ground-state molecules in a two-species magneto-optical trap containing 39K and 85Rb atoms. The KRb are produced via photoassociation detected by multiphoton ionization. had characterized their temperature measured formation rate constant. believe that could be used as reliable source to captured electrostatic, magnetic, or optical traps. This possibility will certainly motivate further investigation quantum collective...

We have investigated the detection of mechanical and disease stresses in citrus plants (Citrus limonia [L.] Osbeck) using laser-induced fluorescence spectroscopy. Due to its economic importance we chosen investigate canker disease, which is caused by Xanthomonas axonopodis pv. citri bacteria. Mechanical stress was also studied because it plays an important role plant's infection such A spectroscopy system, composed a spectrometer 532 nm10 mW excitation laser used perform The ratio two...

The stability of superfluid currents in a system ultracold bosons was studied using moving optical lattice. Superfluid very weak lattice become unstable when their momentum exceeds 0.5 recoil momentum. Superfluidity vanishes already for zero as the deep reaches Mott insulator (MI) phase transition. We study diagram disappearance superfluidity function and depth between these two limits. Our boundary extrapolates to critical superfluid-to-MI transition with 2% precision. When one-dimensional...

Citrus canker and Huanglongbing (HLB) are citrus diseases that represent a serious threat to the production worldwide may cause large economic losses. In this work, we combined fluorescence imaging spectroscopy (FIS) machine learning technique discriminate between these other ordinary conditions be present at orchards, such as scab zinc deficiency. Our classification results highly accurate when discriminating from (97.8%), HLB deficiency (95%). These show it is possible accurately identify...

We have measured the total collisional loss rate for ultracold sodium atoms held in a magneto-optical trap (MOT) as function of light intensity trap. extract constant by measuring temporal behavior MOT loading from background vapor. The increases with satisfactory agreement new calculations, which are also presented. results interpreted terms detailed collision processes.

In this study, we combine a fluorescence imaging technique and two machine-learning methods to discriminate Huanglongbing (HLB) disease from zinc-deficiency stress on samples Florida, USA. Two classification methods, support vector machine (SVM) artificial neural network (ANN), are used. Our results present high accuracy for both methods: 92.8% SVM 92.2% ANN. The Florida also compared São Paulo State, Brazil. This comparison indicates that the can be applied HLB zinc deficiency in states.

We present experimental results of two-color photoassociative ionization (TCPAI) spectroscopy in a magneto-optical trap. A probe light beam traces out the frequency (and intensity) dependence TCPAI. By manipulating intensities trap and repumper lasers we investigate participation different hyperfine ground-state levels demonstrate conditions under which molecular bound states figure collision intermediate.

We have produced a magneto-optical trap that simultaneously confines two different atomic species: sodium and potassium. A measurement of the loss rate constant due to collisions with cold potassium atoms was performed. extract this by measuring temporal behavior loading process in presence absence The is obtained can be qualitatively explained using simple existing models. Future applications simultaneous trapping are discussed.

We demonstrate suppression of two-color photoassociative ionization in a sodium vapor magneto-optical trap by imposing an auxiliary "suppressor" light beam on the ensemble colliding trapped atoms. interpret experimental results terms simple picture which suppressor intercepts incoming reactant particle flux and reroutes it to long-range repulsive states, effectively preventing further approach collision pairs.

In this work, we have applied laser-induced fluorescence spectroscopy to investigate biological processes in orange trees (Citrus aurantium L.). We chosen water stress and Citrus Canker, which is a disease caused by the Xanthomonas axonopodis pv. citri bacteria. The was investigated using as an excitation source 442-nm 15-mW HeCd gas multimode discharge laser 532-nm 10-mW Nd3+:YAG laser. manifestation detected variation of ratios leaves at different wavelengths. present significant...

The overall objective of this work was to develop and evaluate computer vision machine learning technique for classification Huanglongbing-(HLB)-infected healthy leaves using fluorescence imaging spectroscopy. images were segmented normalized graph cut, texture features extracted from the cooccurrence matrix. used as an input into classifier, support vector (SVM). results evaluated based on accuracies number false positives negatives. indicated that SVM could classify HLB-infected leaf...

We consider the excitation of Rydberg states through photons carrying an intrinsic orbital angular momentum degree freedom. Laguerre–Gauss modes, with a helical wave-front structure, correspond to such set laser beams, which carry units in their propagation direction, ℓ0 winding number. demonstrate that, proper geometry setting, this can be transferred internal degrees freedom atoms, thus violating standard dipole selection rules. Higher become accessible single photon process. investigate...

Abstract In this work, we have combined fluorescence imaging spectroscopy (FIS) and supervised learning methods to identify discriminate between citrus canker, Huanglongbing, other leaf symptoms. Our goal is differentiate these diseases nutrient conditions without prior eye assessment of Five were evaluated. results show that by combining FIS with a convolutional neural network (AlexNet), it possible the disease sample up 95% accuracy. An enormous gain time substantial cost reduction...

In this work we measure the time evolution of population resulting from energy-transfer collisions as a function energy difference between entrance and exit collisional channels using sample cold Rydberg atoms produced in rubidium magneto-optical trap. The 34S(1/2) population, by 33P(3/2) state, is monitored through pulsed-field ionization technique. experimental results are compared with recent published model based on two-body interaction considering an attractive potential [Phys. Rev. A...

We report results on inelastic cold collisions for a mixed species magneto-optical trap containing Na and Rb. The rate of collisional loss is due to different contributions: Na-Na Na-Rb collisions. Both parts are investigated with respect laser intensity frequency. observations explained based Gallagher-Pritchard model. Possibilities studies applications involving traps discussed.

Objective: The goal of this study is to determine the optical properties different rat tissues with respect spatial intensity variation and light distribution. We are interested mainly in wavelength 630 nm. Nevertheless, for liver tissue we have used 514 nm 670 as well. Background Data: In past, many articles been written about interaction lasers tissues. However, technique imaging distribution allows us obtain scattering well an effective attenuation coefficient intensity. Methods: Slices...

In this paper, we demonstrate the use of a cold trapped sample neutral atoms to perform high-precision measurement lifetime for sequence Rydberg states ${}^{85}\mathrm{Rb}.$ States principal quantum number lying between $n=31$ and $n=45$ are produced their lifetimes measured using field ionization. Experimental results compared with existing theories. This is an important demonstration concerning possibilities spectroscopy in time domain atomic samples.

We have observed a heteronuclear trap loss rate for mixture of trapped ${}^{39}\mathrm{K}$ and ${}^{85}\mathrm{Rb}$ atoms. Our results indicate that hyperfine changing collision radiative escape dominate in the low high intensity regimes, respectively. They are also consistent with taking place participation doubly excited state potential $({\mathrm{K}}^{*}\ensuremath{-}{\mathrm{Rb}}^{*}).$ A Gallagher-Pritchard model into account channel was implemented, reproducing experimental well...

The behaviour of interacting ultracold Rydberg atoms in both constant electric fields and laser is important for designing experiments constructing realistic models them. In this paper, we briefly review our prior work present new results on how affect atoms. Specifically, address the topics background atom pair excitation laser-induced Stark shifts excitation.