A NEW APPROACH TO MOLECULAR CLASSICAL OPTIMAL-CONTROL - APPLICATION TO THE REACTION HCN-]HC+N

被引:41
作者
BOTINA, J
RABITZ, H
RAHMAN, N
机构
[1] UNIDO,INT INST PURE & APPL CHEM,I-34012 TRIESTE,ITALY
[2] PRINCETON UNIV,DEPT CHEM,PRINCETON,NJ 08544
关键词
D O I
10.1063/1.469395
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We present a new method for classical control theory of Hamiltonian systems. This approach is based on a special treatment of the adjoint or Lagrange multiplier equations of motion. The latter function is only asked to preserve the mean of the ensemble of molecular trajectories. In the present case only four such equations are involved greatly simplifying the field design process and making it faster and more stable. Good results are obtained for the selective photodissociation of HCN. The objective is to control the intramolecular reaction HCN→HC+N (i.e., break the stronger bond). Hamilton's equations of motion are employed to model the HCN molecule, initially in its ground state. The control equations are integrated to obtain a high degree of selectivity in the unimolecular dissociation. The robustness of the results to changes in the initial conditions and pulse durations are investigated. An increase of the pulse duration beyond a certain point makes it more difficult to dissociate the N atom due to strong intramolecular coupling. The resultant pulse fields may serve as a basic indicator for future experimental selective dissociation of HCN→HC+N using high power lasers. © 1995 American Institute of Physics.
引用
收藏
页码:226 / 236
页数:11
相关论文
共 40 条
[1]  
Allen M.P., 1987, COMPUTER SIMULATION
[2]  
[Anonymous], 1955, MOL VIBRATIONS
[3]   ISOTOPIC MASS AS DISCRETE CONTROL VARIABLE IN CHAOTIC PROCESSES - THE CASE OF MOLECULAR VIBRATIONS [J].
BOTINA, J ;
PICHIERRI, F ;
RAHMAN, N .
CHEMICAL PHYSICS LETTERS, 1993, 208 (3-4) :153-158
[4]   ANHARMONIC POTENTIAL-ENERGY SURFACES, VIBRATIONAL FREQUENCIES AND INFRARED INTENSITIES CALCULATED FROM HIGHLY CORRELATED WAVEFUNCTIONS [J].
BOTSCHWINA, P .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS II, 1988, 84 :1263-1276
[5]  
Bryson A.E, 1975, APPL OPTIMAL CONTROL
[6]   COHERENT RADIATIVE CONTROL OF IBR PHOTODISSOCIATION VIA SIMULTANEOUS (OMEGA-1,OMEGA-3) EXCITATION [J].
CHAN, CK ;
BRUMER, P ;
SHAPIRO, M .
JOURNAL OF CHEMICAL PHYSICS, 1991, 94 (04) :2688-2696
[7]   CONTROL OF MOLECULAR VIBRATIONAL-EXCITATION AND DISSOCIATION BY CHIRPED INTENSE INFRARED-LASER PULSES - ROTATIONAL EFFECTS [J].
CHELKOWSKI, S ;
BANDRAUK, AD .
JOURNAL OF CHEMICAL PHYSICS, 1993, 99 (06) :4279-4287
[8]   CONTROL OF ISOMERIZATIONS BY SERIES OF ULTRAFAST INFRARED-LASER PULSES - MODEL SIMULATIONS FOR SEMIBULLVALENES [J].
COMBARIZA, JE ;
GORTLER, S ;
JUST, B ;
MANZ, J .
CHEMICAL PHYSICS LETTERS, 1992, 195 (04) :393-399
[9]   OPTIMALLY CONTROLLED QUANTUM MOLECULAR-DYNAMICS - A PERTURBATION FORMULATION AND THE EXISTENCE OF MULTIPLE SOLUTIONS [J].
DEMIRALP, M ;
RABITZ, H .
PHYSICAL REVIEW A, 1993, 47 (02) :809-816
[10]  
DEMIRALP M, IN PRESS