Coherent Laser Control of the Product Distribution Obtained in the Photoexcitation of HI

Abstract

vations of a discontinuity near 1150 km in subduction arcas [(3, 6), for example] indicates that this may be a global feature o t yet unknou.n nature.T h e observation of reflectors at mid-1ua11tle iiepths comparable to those in subduction zones, hut in a different environment, indicates that a search for yet unidentitied nlineral asscnlblagcs o t global significance may he ~\.orthn.hilc. Recent cxperiments have shown the possihle existence of phase tra~lsitions at lolvcr mantle conditions: orthorhomhic-to-c~113ic silicate pcrovskite (3d) a i d rutile SiOz to CaClz structure ( 3 1 ). T h e role ancl proportions of volatiles such as water or carbon dioxide in the nlantle remain largely unknown and co~lld he o t importance (32). Additional seismic observations with the great resolving power of BB arrays s110~11ci help answer the yucstio~n o t the global character of our observations.

Excitonic effects on the two-color coherent control of interband transitions in bulk semiconductors

“…36 For 'allowed-forbidden' two-photon transitions, substituting (24) and the second term of (25) into (22),…”

Coherent control using adaptive learning algorithms

“…Thus, operators that produce good pulses are given the opportunity to produce more children. Specifically, credit is assigned when either (1) an individual pulse shape in the current generation is more fit than the best pulse shape of the previous generation, or (2) an individual was an ancestor of a pulse shape that is more fit than the best pulse shape of the previous generation. Passing credit back more than one generation is important, since some operators tend to act in concert.…”

“…Control is hampered by fast relaxation, complicated mode structure, imperfect knowledge of the inter-nuclear potentials along arbitrary coordinates, and the distorting influence of the strong external light fields. Recent theoretical [1] and experimental advances have led to successful control of molecular ionization and dissociation [2,3], atomic and molecular fluorescence [4][5][6], and excitations or electrical currents in semiconductors [7][8][9]. Control has been predicted and demonstrated in several systems that have only two interfering pathways [2,8,9].…”

Photodynamic control using field optimized initial state: A mechanistic investigation of selective control with application to IBr and HI photodissociation

“…In any case, treatment of rotational effects will increase the computational complexities by at least an order of magnitude 37 and we have therefore found it judicious to neglect rotational motion in this initial application. Photodissociation of IBr 21,26,[38][39][40][41][42][43] and HI [9][10][11][12][13][14][15][16]20 have been studied extensively and are our representative systems of choice. In the following section we analyze some representative max (0) for IBr and HI to investigate the mechanistic underpinning of photodynamic control of product selectivity and yield.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12] The different established theoretical approaches to control have been reviewed recently. 1 While the focus of these theoretical approaches has been on field design, the photodissociation yield has also been found to be extremely sensitive to the initial vibrational state from which photolysis is induced.…”