53,957 research outputs found
Photon echoes of molecular photoassociation
Revivals of optical coherence of molecular photoassociation driven by two
ultrashort laser pulses are addressed in the Condon approach. Based on textbook
examples and numerical simulation of KrF excimer molecules, a prediction is
made about an existence of photon echo on free-bound transitions. Delayed rise
and fall of nonlinear polarization in the half-collisions are to be resulted
from the resonant quantum states interference whether it be in gas, liquid or
solid phases.Comment: 15 pages and 5 figures presented at ICONO '98'(Moscow, 1998):
Fundamental Aspects of Laser-Matter Interaction, New Nonlinear Optical
Materials and Physics of Low-Dimensional Structure
On joint distributions of the maximum, minimum and terminal value of a continuous uniformly integrable martingale
We study the joint laws of a continuous, uniformly integrable martingale, its
maximum, and its minimum. In particular, we give explicit martingale
inequalities which provide upper and lower bounds on the joint exit
probabilities of a martingale, given its terminal law. Moreover, by
constructing explicit and novel solutions to the Skorokhod embedding problem,
we show that these bounds are tight. Together with previous results of Az\'ema
& Yor, Perkins, Jacka and Cox & Ob{\l}\'oj, this allows us to completely
characterise the upper and lower bounds on all possible exit/no-exit
probabilities, subject to a given terminal law of the martingale. In addition,
we determine some further properties of these bounds, considered as functions
of the maximum and minimum.Comment: 19 pages, 4 figures. This is the authors' accepted version of the
paper which will appear in Stochastic Processes and their Application
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