Coherent control of a resonance lifetime with laser pulses

Selective coherent control of the lifetime of a resonance state with laser pulses

“…In fact, a study of the control of the lifetime of the Br 2 (B, v = 35)−Ne ground resonance by applying the control scheme using a single pulse of variable width has been recently reported. 39 That work indeed confirmed that the interference pattern found both in the survival probability of the v ground resonance and in the transient population curves for appearance of Br 2 (B, v < v ) products is more intense for v = 35 than in the v = 27 case, as a result of the larger number of v − 1 overlapping resonances interfering with the v one. It is stressed that the v ground resonance survival probability and the Br 2 (B, v < v ) appearance probabilities are observable quantities.…”

“…Previous works using a single pump pulse with increasing bandwidth indicate that the lifetime of the v ground resonance decreases remarkably as the spectral width of the pulse increases, due to the interference of the increasing number of overlapping resonances populated. 31,39 Thus, it is expected that the v ground resonance lifetime would reach a minimum for a delta-function excitation. The most interesting feature of the survival probabilities of Fig.…”

Effect of the Intermolecular Excitation in the Vibrational Predissociation Dynamics of van der Waals Complexes and the Implications for Control

“…It appears, therefore, that should be possible to develop and apply similar schemes to increase and control the lifetime of a resonance as those used to avoid decoherence of the superposition of a system coupled to an environment. Indeed, control schemes based on interference between overlapping resonances have been recently shown to be powerful means to achieve strong enhancements of the lifetime of a resonance state. ,− Other schemes based on the so-called exceptional points and long-lived zero-width resonances have also proven efficient to stabilize molecular systems with respect to dissociation. , …”

Resonant detection of the signature of control of a resonance state lifetime using a pump–probe scheme

“…15,16 The scheme takes advantage of the quantum interference effects that occur between overlapping resonances excited in a coherent superposition. 3,[15][16][17][18] The basis of the control scheme lies in the novel nding that the lifetime of an overlapping resonance is no longer an intrinsic property of the resonance state, as in the case of an isolated resonance, but instead it strongly depends on the amplitudes of the other overlapping resonances populated in the superposition. 15 This effect thus allows one to control the survival probability and the associated lifetime of a specic resonance state by simply modifying with laser pulses the relative amplitudes of the excited resonances overlapping with the target resonance in the superposition prepared.…”

“…Therefore, they are very suitable systems to apply and test control schemes based on interference between overlapping resonances, for that purpose Br 2 -Ne has been chosen in previous work. [15][16][17][18] In addition, the potential-energy surface available for Br 2 (B)-Ne appears to be realistic enough. Indeed, previous time-dependent calculations of the predissociation lifetime of the Br 2 (B, v 0 ¼ 16)-Ne ground resonance state (B and v 0 denoting excited electronic and vibrational states of Br 2 , respectively) using this potential surface gave a value of $70 ps, 15 while the corresponding lifetime obtained experimentally 19 was 68 AE 3 ps.…”