Relaxation characteristics of (6s6p) ³P₁ ¹⁷⁴Yb level

Abstract

First proposal is made to measure the ratio of stimulated photon echo power corresponding to two different mutual orientations of exciting pulses polarizations as a function of the buffer gas pressure to extract the spectroscopic information concerning the relaxation rates difference of orientation and alignment from these measurements. The absolute value of the difference between relaxation characteristics |γb | corresponding to orientation and alignment of 3 P 1 (6s6p) level of 174 Yb due to it's collisions with krypton atoms is measured. The fact of the difference between orientation and alignment relaxation rates is reliably stated. Absolute value of the difference between relaxation rates of orientation and alignment of the level (6s6p) 3 P1 174 Yb under action of collisions with krypton atoms

174Yb3P1level relaxation found via weak magnetic field dependence of collision-induced stimulated photon echo

“…We have found two new phenomena: collisioninduced photon echo (CPE) and collisioninduced stimulated photon echo (CSPE), the last one origin is due to the difference between orientation and alignment decay rates. The numerical value for this difference 1.01•10 6 s −1 , obtained at Xe pressure of 159 mTorr, gives relaxation constants difference of 5.18•10 6 s −1 Torr −1 for ∂(Γ b )/∂p Kr = 6.8•10 6 s −1 Torr −1 obtained by SPE technique in [32].…”

Collision-induced stimulated photon echo at the transition 0–1 in ytterbium: application to depolarizing collisions

“…is small, as compared to each of this decay rates. For the van der Waals interaction between active and buffer atoms, the estimated difference between 2 ( ) γ and 1 In our previous work [6] we could only determine the fact that 2 ( ) γ and 1 ( ) γ are not equal, and we measured the magnitude of this difference as a function of the buffer gas pressure (Kr was used as a buffer in [6]). This work shows a principal possibility to find the sign of this difference.…”

Collision-induced photon echo at the transition0↔1in ytterbium vapor: Direct proof of depolarizing collision anisotropy

“…In particular, inelastic collisions in molecular gases [16], depolarizing collisions in molecular [17] and in atomic gases [18], and the possibility to select the slow molecules [19] were investigated by photon-echo technique.…”