Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1997-01-22
1998-09-15
Tsang, Cecilia J.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
20415722, 20415741, 20415761, C07B 6100
Patent
active
058082565
ABSTRACT:
A target is irradiated with a laser beam having an energy of h.nu.
, where n is an integer, instead of the photon energy h.nu. required for a reaction to proceed using a conventional single-photon excitation method. A desired reaction is selectively induced by the absorption of multiple photons instead of single photons. It is thus possible to induce a photoreaction in which an absorption is carried out in accordance with a selection theory different from that of single-photon absorption, and which is quite different from a photoreaction induced by a single-photon excitation. Namely, a target or reactant is irradiated with a photon energy h.nu..sub.2 having a wavelength integral times longer than that of the photon energy h.nu..sub.1 necessary for a photoreaction to proceed. Photon energy h.nu..sub.2 is either used in place of the photon energy h.nu..sub.1 necessary for a photoreaction, or together with the photon energy h.nu..sub.1, to thereby make the reactant absorb the energy equal to the photon energy h.nu..sub.1. The method is capable of selectively and preferentially inducing a specific photoreaction among various possible, concurrent photoreactions.
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"Detection and Assignment of the Phantom . . . " Stachelek et al, J. Chem. Phys, vol. 66, No. 10, 15 May 1977, 4541-4543.
Kira Mitsuo
Koshihara Shinya
Miyazawa Takashi
Segawa Yusaburo
Delacroix-Muirheid C.
Rikagaku Kenkyusho
Tsang Cecilia J.
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