Infrared transitions probabilities and radiative opacity of SiO

نویسندگان

  • I. Drira
  • J. M. Huré
  • E. Roueff
چکیده

Spectroscopic properties of SiOhave been calculated from highly correlated wave functions. The computed dipole moments for v = 0 − 3 agree well with the experimental data of Raymonda et al. (1970). By comparing the present results with previous theoretical works, we estimate that the resulting line strengths should be the most accurate to date. The Einstein coefficients for the fundamental and the first overtone (v ≤ 40, J ≤ 100) are larger than the currently used values of Tipping & Chackerian (1981), and should be tested in models of stellar atmospheres.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Relation of SiO maser emission to IR radiation in evolved stars based on the MSX observation

Based on the space MSX observation in bands A(8μm), C(12μm), D(15μm) and E(21μm), and the ground SiO maser observation of evolved stars by the Nobeyama 45-m telescope in the v=1 and v=2 J=1-0 transitions, the relation between SiO maser emission and mid-IR continuum radiation is analyzed. The relation between SiO maser emission and the IR radiation in the MSX bands A, C, D and E is all clearly c...

متن کامل

New radiative transition probabilities for Fe IV including fine structure

We present new calculations for transition probabilities of Fe IV, with much more extensive datasets than heretofore available. The large-scale close coupling R-matrix calculations yield 1,798 LS bound states with n ≤ 11 and l ≤ 9, and corresponding transition probabilities for 138,121 dipole allowed transitions in the form of oscillator strengths f , line strengths S , and A-coeffficients for ...

متن کامل

SiO , 29 SiO and 30 SiO excitation : effects of infrared line overlaps

We have investigated the influence of several line overlaps between 28 SiO , 29 SiO and 30 SiO on maser emission from the envelopes of late-type stars using the Large Velocity Gradient radiative transfer formalism modified to account for overlaps. Our model includes: (i) 40 rotational levels for each of the v = 0 to 4 vibrational states and each isotopic species; (ii) collisions with molecular ...

متن کامل

Correlation between Infrared Colors and Intensity Ratios of SiO Maser Lines

We present the results of SiO millimeter-line observations of a sample of known SiO maser sources covering a wide dust-temperature range. A cold part of the sample was selected from the SiO maser sources found in our recent SiO maser survey of cold dusty objects. The aim of the present research is to investigate the causes of the correlation between infrared colors and SiO maser intensity ratio...

متن کامل

Comparison of the quantum efficiencies of interwell and intrawell radiative transitions in quantum cascade lasers

A theoretical study has been made to compare the quantum efficiencies of interwell and intrawell radiative transitions in quantum cascade lasers based on AlxGa1 xAs/GaAs technology. Radiative and non-radiative intersubband transition rates were calculated for a range of temperatures between 4 K and 300 K at an applied electric field of 4 kVcm 1 for structures designed to emit in both mid-infrar...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1997