Collisional depolarization and transfer rates of spectral lines by atomic hydrogen
نویسندگان
چکیده
منابع مشابه
Collisional depolarization and transfer rates of spectral lines by atomic hydrogen . IV : application to ionised atoms
The semi-classical theory of collisional depolarization of spectral lines of neutral atoms by atomic hydrogen (Derouich et al. 2003a; Derouich et al. 2003b; Derouich et al. 2004 and references therein) is extended to spectral lines of singly ionised atoms. In this paper we apply our general method to the particular cases of the 3d D and 4p P states of the CaII ion and to the 5p P state of the S...
متن کاملCollisional Frequency Shifts of Absorption Lines in an Atomic Hydrogen Gas
We consider the effect of interactions on the line shape of the two-photon 1s−2s transition in a (doubly) spin-polarized atomic hydrogen gas in terms of the interatomic interaction potentials. We show that the frequency-weighted sum rule for the intensity of the line is not given simply in terms of the pseudopotentials that describe the interactions between low-energy atoms. The origin of the d...
متن کاملpragmatic transfer in compliment responses and chastisements by iranian learners of english
فرهنگ های گوناگون دریافت ها و تعبیر های مختلفی از تناسب و ادب دارند. بنابراین، ارتباط میان فرهنگی خطرات ذاتی خطای ارتباطی را نشان می دهد. این پژوهش به منظور تعیین وقوع انتقال منظورشناختی زبان در زبان بینابینی زبان آموزان ایرانی، اختلاف منظورشناختی زبان را بین فارسی و انگلیسی در کنش های کلامی پاسخ تحسین و انتقاد بررسی می کند.داده ها از میان 33 آمریکایی انگلیسی زبان، 85 زبان آموز ایرانی در سطوح م...
15 صفحه اولAre collisions with neutral hydrogen important for modelling the Second Solar Spectrum of Ti and Ca ?
Context. The physical interpretation of scattering line polarization offers a novel diagnostic window for exploring the thermal and magnetic structure of the quiet regions of the solar atmosphere. Aims. To evaluate the impact of isotropic collisions with neutral hydrogen atoms on the scattering polarization signals of the 13 lines of multiplet 42 of Ti and on those of the K line and of the IR...
متن کاملAb initio calculation of the transfer and multipole rates of the Na ground state hyperfine levels perturbed by atomic hydrogen
A theoretical treatment of the multipole relaxation and transfer rates due to isotropic collisions is presented. Explicit expressions are obtained for the collisional rate constants of the hyperfine-structured ground level of the Na I atoms perturbed by collisions with H atoms. As the effects of Na nuclear spin during the collision are negligible, it is shown that all the rate constants involve...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2003
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20031058