Vibrational eigenvalues and eigenfunctions for planar acetylene by wave-packet propagation, and its mode-selective infrared excitation
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
Vibrational eigenvalues with estimated errors {lt}5{times}10{sup {minus}2}cm{sup {minus}1} and their corresponding eigenfunctions for {bold J}=0 5D (planar) acetylene modeled by the Halonen{endash}Child{endash}Carter potential-energy surface are obtained using an energy-shifted, imaginary-time Lanczos propagation of symmetry-adapted wave packets. A lower resolution ({approximately}4cm{sup {minus}1}) vibrational eigenspectrum of the system is also calculated by the Fourier transform of the autocorrelation of an appropriate wave packet. The eigenvalues from both approaches are in excellent agreement. The wave function of the molecule is represented in a direct-product discrete variable representation (DVR) with nearly 300000 grid points. Our results are compared with the previously reported theoretical and experimental values. We use our 69 computed eigenstates as a basis to perform an optimal control simulation of selective two-photon excitation of the symmetric CH-stretch mode with an infrared, linearly polarized, transform-limited, and subpicosecond{endash}picosecond laser pulse. The resulting optimal laser pulses, which are then tested on the full DVR grid, fall within the capabilities of current powerful, subpicosecond, and tunable light sources. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 527995
- Journal Information:
- Journal of Chemical Physics, Vol. 107, Issue 9; Other Information: PBD: Sep 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Efficient pointwise representations for vibrational wave functions: Eigenfunctions of H/sup +//sub 3/
Bond selective infrared multiphoton excitation and dissociation of linear monodeuterated acetylene