Effects of Quantum Interference on the Profile of Excitation Spectra in the Atomic Sodium D_1

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Radiative lifetime and oscillator strength determination in Mg-like potassium (K VIII)

Theoretical transition probabilities have been obtained for 54 n = 3 transitions depopulating the 3s3p ¹P^o, 3p^{2 3}P, ¹D, ¹S, 3s3d ¹D, ³D and 3p3d ³P^o, ³D^o, ³F^o, ¹F^o, ¹D^o, ¹P^o levels, including 14 transitions not yet observed. Some of these predictions have been compared with experimental lifetimes obtained by beam-foil spectroscopy for four n = 3 levels of K⁷⁺. An excellent agreement is observed between theory and experiment for all the levels. Received 23 January 2002 / Received in final form 23 April 2002 Published online 19 July 2002     

用Monte Carlo模拟方法研究ICP－AES中的电离和激发过程──Ⅱ．有关电离激发机理的讨论

本文应用ＭｏｎｔｅＣａｒｌｏ模拟所得到的结果，定量地评价ＩＣＰ中各种可能发生的反应过程对电离激发的贡献，详细讨论了不同条件下ＩＣＰ中分析元素电离激发机理。结果表明ＩＣＰ中存在的电离激发机理很大程度上取决于电子密度，温度以及氢等粒子的密度。     

Temperature dependence of the fine structure of vibronic bands of fluorescence of 1,4,5,8-tetraoxy-9,10-anthraquinone in a polymer matrix

L. Ya. Karpov Physicochemical Research Institute, 10, Obukhov Str., Moscow, 103064, Russia. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 65–69, March–April, 1995.     

Measurement of cross-section of excitation transfer from 3s2 to 4s1 and 5s1 energy levels of neon

Collision induced non-radiative transitions in neon plasma have been studied using high intra-cavity radiation field of a 633 nm He-Ne laser. The transitions, induced from 3s ₂ energy level to 4s₁ and 5s₁ groups of energy levels, have been detected as changes in intensities of the spectral lines originating from these energy levels. From these intensity measurements, the quantities governing the transitions i.e. (i)S ₃ ^e /S _3RT , the ratio of the probabilities of electronic deexcitation to the total radiative deexcitation of energy level 3 (ii) 〈r ₂₃ ^e v _e〉, rate of excitation transfer per particle and (iii)S ₂₃ ^e , the total probability for excitation transfer from level 2 to level 3 at a certain value of electron density have been calculated.     

Luminescence Centers of Pr3+ in Gallium Sulfide Single Crystals

The luminescence and luminescence excitation spectra of GaS:Pr single crystals are investigated. It is shown that in the single crystals of gallium sulfide the luminescence centers can be at two positions. The symmetry of the environment and the structure of these centers are considered.     

Dissociative excitation of a cesium atom in collisions of slow electrons with CsF molecules

The method of extended intersecting beams is used for studying inelastic collisions of electrons with cesium fluoride molecules. Forty-six cross-sections for dissociative excitation of the spectral lines of a cesium atom located in the spectral region 387–825 nm were used. The behavior of the sections in the spectral series of a cesium atom is investigated, which is reflected by a power law. The values of constants that are parameters in the power-law formula are determined. Moscow Power Engineering Institute, 14, Krasnokazarmennaya St., E-250, Moscow, 105835, Russia. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 20–25, January–February, 1997.     

Optical properties of neodymium incorporated in porous silicon

We report the optical properties of Nd-incorporated porous silicon. Photoluminescence and photoluminescence excitation measurements have been performed. Room temperature emission spectra from dried or annealed samples have been studied. While steady-state photoluminescence results indicate porous silicon light absorption by the Nd, the photoluminescence excitation shows a deficiency of energy transfer between porous silicon and Nd ions.     

Optical properties of -doped semiconductors: Plasmon–phonon coupling and Raman spectra

Collective excitations and their coupling to optical phonons have been studied for a two-dimensional electron gas in -doped polar semiconductors within the random-phase approximation. The inelastic light scattering spectrum due to the coupled plasmon–phonon modes are calculated for the multisubband two-dimensional electron systems. Our calculation shows that, due to the high electron density in these systems, both intrasubband and intersubband plasmons are strongly coupled to the optical-phonons. On the other hand, due to the high impurity concentration, level broadening modifies the inelastic light scattering spectrum significantly.     

Nucleon—Pair Shell Model：Magnetic Excitations for Ba Isotopes

Magnetic excitations for Ba isotopes are discussed within the nucleon-pair shell model truncated in the SD subspace.With the SD pair determined by a surface-δ interaction,M1 transitions for ^134Ba are well fitted.The M1 and M3 transitions for ^132Ba and ^130Ba are also predicted.It is shown that the statement,the collective magnetic properties are due to the orbital motion of nucleons,is approximately valid.