The application of lasers to photochemical studies has resulted in the ability to produce high-intensity, multiple-photon, photochemical reactions. The absorption of two or more photons by a molecule, or transient intermediate, can result in the production of a higher excited state in an intratransient reaction. The production of higher concentrations of transient intermediates, such as radicals, biradicals, carbene, or nitrenes, can also be achieved using this technique. The higher concentrations increase the likelihood for an intertransient reaction to occur between two such intermediates. Both of the aforementioned cases can lead to the formation of photochemical products that previously had not been observed under conventional, low-intensity, conditions.; High-intensity reactions have been investigated in this laboratory using the argon-ion, laser-jet apparatus. A number of compounds were chosen for this research to possibly provide answers to questions resulting from previous observations under high-intensity conditions. The types of reactions studied were symmetry-governed reactions: 3,4-benzocoumarin (11) and bifluorenylidene (22); and intertransient reactions: 1,8-naphthalic anhydride (26), 2,3-naphthalic anhydride (31), N-phenyl-1,8-naphthalimide (37), N-phenyl-2,3 naphthalimide (38), and N-phenyl-phthalmide (39). The application of the laser-jet technique to photo-induced electron transfer reactions was also investigated. Two classes of compounds were investigated as possible targets for this type of reaction: diphenylalkanediones; 1,6-diphenyl-1,6-hexanedione (41), 1,8-diphenyl-1,8-octanedione (42), 1,10-diphenyl-1,10-decanedione (43), and 1,12-diphenyl-1,12-dodecanedione (44); and N-(phenylalkyl)phthalimides; N-(3-phenylpropyl)phthalimide (68) and N-(4,4,4-triphenylbutyl)phthalimide (71). The incorporation of an excimer laser in the laser jet technique, along with the required modifications of the laser-jet apparatus, also is reported.
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机译：激光在光化学研究中的应用导致了产生高强度多光子光化学反应的能力。一个分子或瞬态中间体对两个或多个光子的吸收可导致在瞬态反应中产生更高的激发态。使用这种技术也可以生产更高浓度的瞬态中间体，例如自由基，双自由基，卡宾或腈。较高的浓度增加了在两个这样的中间体之间发生瞬态反应的可能性。上述两种情况都可能导致形成光化学产物，而以前在常规的低强度条件下还没有观察到这种现象。在这个实验室中已经使用氩离子激光喷射设备研究了高强度反应。选择了许多化合物进行这项研究，以可能为先前在高强度条件下的观察结果所引起的问题提供答案。研究的反应类型是对称控制的反应：3,4-苯并香豆素（ 11 ）和联芴基（ 22 ）；和瞬态反应：1,8-萘酐（ 26 ），2,3-萘酐（ 31 ）， N -苯基-1 ，8-萘二甲酰亚胺（ 37 ）， N -苯基-2,3萘二甲酰亚胺（ 38 ）和 N -苯基邻苯二甲酰亚胺（ 39 ）。还研究了激光喷射技术在光致电子转移反应中的应用。研究了两类化合物作为这类反应的可能靶标：二苯基烷二酮； 1,6-二苯基-1,6-己二酮（ 41 ），1,8-二苯基-1,8-辛烷二酮（ 42 ），1,10-二苯基- 1,10-癸二酮（ 43 ）和1,12-二苯基-1,12-十二烷二酮（ 44 ）;和 N -（苯基烷基）邻苯二甲酰亚胺； N -（3-苯基丙基）邻苯二甲酰亚胺（ 68 ）和 N -（4,4,4-三苯丁基）邻苯二甲酰亚胺（ 71 ）。还报道了在激光喷射技术中引入准分子激光器，以及对激光喷射设备进行所需的修改。
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