Investigation of collisional lineshapes of neon transitions in noble gases' mixtures

Parametric investigation of the isotope shift in odd configurations of Ne i

“…For the SAS measurements the hollow-cathode operates with a high current of 500 mA, which reduces velocity changing collisional effects. Details of these effects are described in [22][23][24]. Three recordings of SAS intensity profiles with various discharge currents are shown in Fig.…”

“…Due to the low natural abundance of 21 Ne and its hyperfine splitting, isotope shift (IS) values are difficult to measure for this isotope. Therefore, most experimental IS data are determined between the even isotopes 20 Ne and 22 Ne.…”

“…The noble gas Neon, with atomic number 10, has three stable isotopes in its natural abundance: 20 Ne with 90.9%, 21 Ne with 0.3% and 22 Ne with 8.8%. Due to the low natural abundance of 21 Ne and its hyperfine splitting, isotope shift (IS) values are difficult to measure for this isotope.…”

Velocity changing collisions in the laser saturation spectra of 87Rb D2 F″ = 2

“…Collisions that reverse the velocity of the absorber along the direction of the laser beam can lead to rising baseline, or Doppler pedestal. A description of the saturation spectroscopy lineshapes was developed for strong collisions in the early work [4] and later extended to opto-galvanic detection [5]. The Doppler pedestals depend on buffer gas pressure and modulation frequency.…”

Polarization spectroscopy of atomic oxygen by dye and semiconductor diode lasers

“…These collisions rethermalize the velocity distribution altered by the laser radiation and give rise to a saturation signal also when the laser frequency is out of resonance [9]. However, experimental conditions can be found which lead to a reduction of this pedestal by means, for example, of fast amplitude modulation of the pump beam [10] or high-current operation of the discharge [11].…”