共查询到20条相似文献,搜索用时 31 毫秒
1.
Quantum-chemical calculations of the excited electronic states of a porphyrin dication have been performed by the CNDO/S method
for different angles determining the saddle-like and ruffled distortions of the porphyrin macroring. It is shown that saddle-like
distortions arising as a result of a tilt of the pyrrole rings have a significant influence on the energies of the molecular
orbitals and energies of the excited electronic states of porphyrin molecules, especially on the oscillator strength of the
G→Q transition. The results of the calculations performed are in good agreement with the experimental spectra of porphyrin
dications.
To whom correspondence should be addressed.
Reported at the VIIIth International Conference on Spectroscopy of Porphyrins and Their Analogs, Minsk, September 22–26, 1998.
Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 4, pp. 559–562, July–August, 1999. 相似文献
2.
The influence of changes in the refractive indices of the active medium and the loss modulator on the amplitude-detuning characteristic
of a CO2 laser was theoretically investigated. It is shown that at a comparatively great magnitude of sweeping the “instantaneous”
lasing frequency, the magnitude of the laser response increases not only in negative detunings, but also over a wide range
of positive detunings. The use of the procedure of changing the magnitude and sign of detuning as well as the range of sweeping
and the frequency of modulation makes it possible to realize various periodic and chaotic regimes of lasing, i.e., to exercise
control over the time and energy parameters of pulses over a very wide range.
B. I. Stepanov Institute of Physics of the Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 3, pp. 318–324, May–June, 1997. 相似文献
3.
Stable-plasma generators, spectroscopic measuring equipment, and methods for determining the optical properties of an extremely
heated medium with a given composition have been developed. The spectral coefficients of absorption and emission of heated
air, carbon dioxide, and argon were studied. A comparison with the data of other theoretical and experimental investigations
has been performed.
Deceased.
Institute of Molecular and Atomic Physics of the Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 6, pp. 818–826, November–December, 1997. 相似文献
4.
The nonlinear dynamics of a waveguide CO2 laser with combined periodic loss and pumping modulation is investigated theoretically and experimentally. The possibilities
of controlling time and energy parameters of the output radiation using the corresponding selection of the detuning of the
cavity's longitudinal mode from the center of the amplification line, the amplitude, and the frequency of loss modulation
are demonstrated. The observed asymmetric dependence of the lasing-radiation density on the detuning of the cavity frequency
is explained by the attendant modulation of the refractive index of the loss modulator.
To whom correspondence should be addressed.
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 4, pp. 471–478, July–August, 1999. 相似文献
5.
Based on the measured spectra of the action of the process of cis-trans-NH(ND)-isomerization of 5-cyano-2,2,8,8,12,13,17,
18-octamethylisobacteriochlorin (H2-COMiBCh) and its deuteroderivative (D2-COMiBCh) in polycrystalline matrices of n-octane and r hexale at 4.2 K, it is established that the character of embedding
of COMiBCh in the matrices of n-alkanes has a substantial effect on the barrier of dark rearrangement and the rate of photoinduced
NH(ND)-rearrangement, while deuteration of the center of a molecule shifts the dynamic equilibrium toward a trans-form in
photoexcitation.
To whom correspondence should be addressed.
Reported at the VIIIth International Conference on Spectroscopy of Porphyrins and Their Analogs, Minsk, September 22–26, 1998.
Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70, F. Skorina, Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 4, pp. 555–559, July–August, 1999 相似文献
6.
A. I. Trokhimets 《Journal of Applied Spectroscopy》1995,62(1):88-90
Institute of Physicoorganic Chemistry, Academy of Sciences of Belarus, 220603, Minsk, Ul. Surganova, 13, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 1, pp. 104–107, January–February, 1995. 相似文献
7.
B. I. Stepanov Institute of Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 200–205, March–April, 1995. 相似文献
8.
Institute of Molecular and Atomic Physics Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 128–136, March–April, 1995. 相似文献
9.
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 137–144, March–April, 1995. 相似文献
10.
K. N. Korostik 《Journal of Applied Spectroscopy》1998,65(1):55-61
The influence of stimulated emission delay, dynamic shift in generation frequency, residual charge effect, timing jitter of
the radiation and excitation regime of an injection laser, as well as of dispersion in a fiber light guide on the data-internal
storage time in an electrooptical contour is investigated. It is found that the storage duration of an interval depends strongly
on the lifetime of nonequilibrium charge carriers, the simultaneous effect of a residual charge and jitter in an injection
laser, as well as on the dc bias current of the laser.
Belarusian State University, 4. F. Skorina Ave., Minsk, 220050, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 65, No. 1, pp. 56–61, January–February, 1998. 相似文献
11.
N. A. Borisevich D. A. Kazberuk S. V. Mel'nichuk S. A. Tikhomirov G. B. Tolstorozhev 《Journal of Applied Spectroscopy》1995,62(3):441-446
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70 F. Skaryna Ave, Minsk 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 3, pp. 49–55, May–June, 1995. 相似文献
12.
A. P. Losev I. N. Nichiporovich S. M. Bachilo G. D. Egorova D. I. Volkovich K. N. Solov'yo 《Journal of Applied Spectroscopy》1995,62(2):311-320
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, Minsk, 220072, 70, F. Skorina Ave., Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 152–163, March–April, 1995. 相似文献
13.
V. A. Zhdanovskii E. F. Zolotovskaya V. N. Snopko O. V. Tsaryuk 《Journal of Applied Spectroscopy》1995,62(6):1127-1130
B. I. Stepanov Institute of Physics, Academy of Sciences of Belarus, 70 F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 6, pp. 170–173, November–December, 1995. 相似文献
14.
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70 F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Specktroskopii, Vol. 62, No. 6, pp. 81–86, November–December, 1995. 相似文献
15.
Institute of Physicoorganic Chemistry, Academy of Sciences of Belarus, 13, Surganov Str., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 63, No. 2, pp. 258–263, March–April, 1996. 相似文献
16.
V. V. Sapunov 《Journal of Applied Spectroscopy》1996,63(4):514-521
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70. F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 63, No. 4, pp. 613–621, July–August, 1996. 相似文献
17.
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 145–150, March–April, 1995. 相似文献
18.
Regression relations between the first main component, slope of the SBC curve towards the wavelength axis, and the degree
of mineralization of peat soils are established from experimental data. Errors in determination of peat soil productivity
are estimated using different spectral indices. For practical use it is recommended to measure the spectral brightness coefficients
of peat soils in the 0.50–0.75 μm range.
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 1, pp. 102–106, January–February, 1998. 相似文献
19.
A. P. Prishivalko 《Journal of Applied Spectroscopy》1995,62(6):1116-1123
B. I. Stepanov Institute of Physics, Academy of Sciences of Belarus, 70 F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 6, pp. 157–165, November–December, 1995. 相似文献
20.
E. A. Yanovskaya Yu. N. Chiberkus A. F. Yanovskii 《Journal of Applied Spectroscopy》1997,64(5):658-662
We present the results of comprehensive investigations that include remote spectral measurements under field conditions, laboratory
experiments, and mathematical simulation of the radiative regime of winter rye sowings.
B. I. Stepanov Institute of Physics, Academy of Sciences of Belarus, 68, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 5, pp. 646–650, September–October, 1997. 相似文献