Magnetic-field induced enhancement in the fluorescence yield spectrum of doubly excited states in helium.

نویسندگان

  • Magnus Ström
  • Conny Såthe
  • Marcus Agåker
  • Johan Söderström
  • Jan-Erik Rubensson
  • Stefano Stranges
  • Robert Richter
  • Michele Alagia
  • T W Gorczyca
  • F Robicheaux
چکیده

An influence of static magnetic fields on the fluorescence yield spectrum of He in the vicinity of the N = 2 thresholds has been observed. The experimental results are in excellent agreement with predictions based on multichannel quantum defect theory, and it is demonstrated that the Rydberg electron l mixing due to the diamagnetic interaction is essential for the description of the observed fluorescence yield intensity enhancement.

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

Double excitations of helium in weak static electric fields.

A dramatic electric field dependence has been observed in the fluorescence yield spectrum of the doubly excited states in helium, where a rich phenomenology is encountered below the threshold. Fluorescence yields of certain states can be tuned to zero, while other dipole-forbidden states are significantly enhanced, for fields much weaker than 1 kV/cm. Using an R-matrix multichannel quantum defe...

متن کامل

Spectrum of neutral helium in strong magnetic fields

We present extensive and accurate calculations for the excited-state spectrum of spin-polarized neutral helium in a range of magnetic field strengths up to 10 G. Of considerable interest to models of magnetic white dwarf stellar atmospheres, we also present results for the dipole strengths of the low-lying transitions among these states. Our methods rely on a systematically saturated basis set ...

متن کامل

Propensity rule for novel selective double photoexcitation of helium atoms in strong static electric fields.

We studied the double photoexcitation spectra of helium in a strong dc electric field and compared the results with the recent experimental data of Harries et al. [Phys. Rev. Lett. 90, 133002 (2003)]]. We derived the propensity rules based on the crossing or noncrossing of energies in the Stark map to predict the selective subset of doubly excited states that are preferentially populated in suc...

متن کامل

Spatial profiles of electron and metastable atom densities in positive polarity fast ionization waves sustained in helium

Fast ionization waves (FIWs), often generated with high voltage pulses over nanosecond timescales, are able to produce large volumes of ions and excited states at moderate pressures. The mechanisms of FIW propagation were experimentally and computationally investigated to provide insights into the manner in which these large volumes are excited. The two-dimensional structure of electron and met...

متن کامل

Calculations of energies of intrashell doubly excited states of beryllium-like ions

Energy levels of doubly excited states of beryllium-like ions are calculated using the conventional configuration-interaction method. The interactions of the two outer electrons with the inert ls2 core electrons are represented by a model potential. The resulting energies of ls23/3[’ and 1s24/4/’ doubly excited states, designated in terms of the K, T and A correlation quantum numbers, are used ...

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:
  • Physical review letters

دوره 97 25  شماره 

صفحات  -

تاریخ انتشار 2006