The shifting of the luminescence spectrum of crystals with 0 ~ I0 ~~ ~-cm into the long- wave region (Fig. 5) in comparison with the luminescence spectrum of lower-resistance crys- tals may be explained in that, in high-resistance crystals, a large amplification factor is achieved, as indicated by the considerably greater brightness of the radiation. These crys- tals have a large photoluminescence efficiency and a relatively low threshold for stimulated radiation with optical excitation. The absence of a short-wave band in the spectrum of streamer luminescence is due to the much-reduced brightness of the radiation from the end of the streamer in comparison with that from the streamer volume, in the given case. LITERATURE CITED I. N.G. Basov, A. G. Molchanov, A. S. Popov, et al., Zh. Eksp. Teor. Fiz., 70, No. 5, 1751-1761 (1976). 2. A.Z. Obidin, A. N. Pechenov, Yu. M. Popov, and V. A. Frolov, Kvantovaya Elektron., i0, No. 6, 1165-1170 (1983). 3. V.P. Gribkovskii, V. V. Parashchuk, and G. P. Yablonskii, Fiz. Tekh. Poluprovodno, !i, No. 4, 626-630 (1977). 4. V.V. Zubritskii, G. P. Yablonskii, and V. P. Gribkovskii, Fiz. Tekh. Poluprovodn., 17, No. 3, 402-408 (1983). 5. V.P. Gribkovskii, A. A. Gladyshchuk, V. V. Zubritskii, et al., PhysB Status Solidi (a), 77, No. 2, 765-774 (1983). 6. V.V. Zubritskii, in: Abstracts of the Proceedings of the Fifth All-Union Conference on the Physics and Technology of the Use of AIIB VI Semiconductors [in Russian], Vol. 2, Vil'nyus (1983), pp. 37-38. 7. L.A. Chernozatonskii, Pis'ma Zh. Eksp. Teor. Fiz., 38, No. 5, 225-228 (1983). 8. A.Z. Obidin, A. N. Pechenov, Yu. M. Popov, et al., Kvantovaya Elektron., 9, No. 8, 1530- 1535 (1982). 9. A.A. Vorob'ev and G. A. Vorob'ev, Electrical Breakdown and Failure of Solid Dielectrics [in Russian], Vysshaya Shkola, Moscow (1966), p. 86. INFLUENCE OF COMPLEX FORMATION ON THE LASER RADIATION OF OXOAROMATIC COMPOUNDS S. A. Krashakov, A. I. Akimov, G. M. Rodchenkov, and B. M. Uzhinov UDC 541.571.9:621o375~826 There has recently been a surge of interest in photoprocesses occurring in the active media of dye lasers and their influence on the spectral and energy characteristics of laser radiation. One such process, in particular, is the formation of hydrogen-bond complexes (HBC) of dyes in the ground and excited states. It has been shown for the example of the phthalim- ides [I] and some coumarin derivatives [2] that the use of dye complexes with polar additives (proton donors) permits considerable broadening of the wavelength tuning range and, in a num- ber of cases, increase in the efficiency of laser radiation. In the present work, the acid-- base reaction of some oxoaromatic compounds -- N-phenylacridone, 3-methoxybenzanthrone, and 9- diethylamino-benz(a)phenoxazine 5-one (oxazine 17) -- in the ground and excited states in aprotonic solvents is investigated, together with its influence on the generational charac- teristics. The composition and structure of the complexes and also the influence of the acid-- base properties of the components and the polarity of the solvent on the reaction of proton phototransfer are considered. The materials used in the present work are N-phenylacridone, 3-methoxybenzanthrone, and oxazine 17 of the grade "for quantum electronics," as well as pure or chemically pure solvents which are purified by standard methods. The absorption spectra are measured on a two-beam Pye Unicam 8000 spectrometer and the fluorescence spectra on an Elyumin 2M spectrofluorimeter. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 42, No. 6, pp. 896-901, June, 1985. Original article submitted August 2, 1983; revision submitted January 5, 1985. 0021-9037/85/4206-0605509.50 1985 Plenum Publishing Corporation 605