We have studied the fidelity of spatial entanglement between dissociated atom and ion from two photon dissociation of hydrogen molecular ion H 2 + . Two processes for two photon dissociation of molecular ion have been considered (i) sequential two photon (STP) absorption and (ii) correlated two photon (CTP) absorption by the molecular ion. We compared the results for fidelity of spatial entanglement (FSE) between dissociated atom and ion for these two types of dissociation. In a previous study in our group [1] we have shown that when an atom interact with nonlocal mode of electromagnetic field (which has been derived field theoretically), simultaneous phase-correlated two pho1 ton absorption by the atom occurs within a very short time δt << ω , where ω is the laser frequency, and the rate of this correlated two photon absorption is linear in intensity. This will happen when the photon flux in the interaction region is high i.e. laser intensity is higher than 10 10 W/cm 2 . In this work we have extended this formalism to study the correlated two photon dissociation of molecular ion and to explore the effect of correlation between two simultaneous photo-absorption processes on the fidelity for spatial entanglement of dissociated atom and ion. Dependence of fidelity for spatial entanglement on the photon frequency has been studied for both the STP and CTP dissociation, to show that photon frequency can be used as control parameter to achieve maximum fidelity. Saturation of fidelity with the increase in time at which fidelity was calculated shows the robustness of the processes considered here. A scheme for detection of spatial entanglement between ion and atom has been suggested.
The cross sections for production of 62P1/2 and 62P3/2 ground and metastable atomic thallium states via UV dissociation of the thallium halides TlCl, TlBr, and TlI have been measured at wavelengths 193, 222, 249, 308, and 353 nm using time-resolved atomic resonance absorption spectroscopy. The measured cross sections, which were independent of halide densities up to densities ∼1017 cm−3, were found to represent only 10% to 36% of the total UV absorption cross section at the appropriate wavelength.
A new method for studying dissociative molecular states, complementary to standard spectroscopy techniques, is discussed and its application to the specific case of
Cs2 is reported. Previous multi-photon ionization
experiments1,2 revealed the existence of hybrid absorption resonance, in which one photon causes a molecular transition to a dissociative state and a second photon is absorbed by one of the resulting dissociation fragments. The method of dissociation excitation spectroscopy uses two synchronized pulsed lasers to sequentially excite a dissociative molecular state and then detect the dissociation fragments through atomic excitation followed by collisional ionization. By scanning the wavelength of the laser probing the molecule it is possible to obtain a spectrum giving the relative probability that a specific dissociation product will be formed after photo-absorption in the molecule. The dissociation excitation spectrum, including the fine-structure branching ratio, has been obtained for the case \\[ Cs_{2} + \\gamma \\rightarrow Cs_{2}^{*} \\rightarrow Cs(6^{2}S_{1/2}) + Cs(5^{2}D_{3/2,5/2}) \\] over the wavelength region 4575-6050
AA. This spectrum shows marked similarities to the standard absorption spectrum of
Cs2. The implications for the molecular potentials of
Cs2 will be discussed.