Infrared picosecond laser control of acceleration of neutral atoms: model simulations for the collision pair O + H

Optimal laser control of molecular photoassociation along with vibrational stabilization

“…The objective is to maximize the expectation value of the projection operator The center of the initial wavepacket is r 0 ¼ 13:4 Å and its width is 5.12 Å, so that at t = 0 the dipole moment is negligible in the region of the wavepacket. The position of the infinite barrier is set to L ¼ 47:63 Å % 90 au) and the initial relative kinetic energy h 2 ðk 2 0 þ 1=a 2 Þ=ð2m r Þ % 0:025 eV ð% 201:6 cm À1 Þ corresponds to a collision speed of % 2:25 km=s, which is in the order of magnitude of atomic beam experiments [14]. Convergence for the calculations was found for N = 362 basis states and for the time-step Dt ¼ 0:295 fs.…”

“…(14) and used a Butterworth filter of order m ¼ 25 for which the low and high cut-off frequencies are respectively x l ¼ 360 cm À1 and x h ¼ 10700 cm À1 . Figure and (d), respectively.…”

“…This process is driven by the laser interacting with the colliding atoms via the dipole moment associated with the collision. This phenomenon has been frequently described within a one-dimensional model system considering the Morse potential as the interatomic potential [13][14][15][16][17][18]. Early investigations [13,14] indicated the possibility of efficient vibrational state-selective association of O + H. The relation between the collision momentum and vibrational state-selective association of H + I has also been examined [15].…”

Multiphoton association reaction He + H+ → HeH+ steered by ultra‐short laser pulse

“…The electric field of the laser pulse is expressed as [14][15][16] eðtÞ ¼ e 0 sin 2 pt s p cosðx p tÞ;…”

O oscilador de morse sob a ação de campos externos

“…Em particular, demonstramos que o acoplamento contínuo-contínuo na aproximação linear contém uma distribuição relacionada a derivada da distribuição de Schwartz.Também calculamos os elementos de matriz considerando o momento de dipolo com decaimento exponencial, queé uma forma mais realista para a interação molécula-campo. Nesse caso, demonstramos que os acoplamentos estão relacionados a derivadas dos argumentos de funções hipergeométricas.Como uma aplicação do método desenvolvido, estudamos os fenômenos da excitação vibracional, da dissociação por multiplos fótons e da associação seletiva com pulsos intensos na escala de femto/picosegundos, reproduzimos diversos resultados obtidos por Korolkov et al[19,46,47]. Dando continuidade a esses trabalhos, investigamos a formação de campos de controle pela superposição de pulsos de laser.…”