A rubidium beam is intersected at right angles by a cylindrical electron beam and a counterpropagating, circularly polarized diode-laser beam, tuned to the F{sup {prime}} = 3 {r_arrow} F = 4 hyperfine transition of the 5{sup 2}S{sub 1/2} resonance line (780 nm) of {sup 85}Rb. Optical pumping creates {sup 85}Rb 5{sup 2}P atoms in a pure spin and angular momentum state {vert_bar}F=4, M{sub F}=4{r_angle} = {vert_bar}J=3/2, M{sub J}=3/2{r_angle}={vert_bar}M{sub L}=1, M{sub S}=1/2{r_angle}. Electrons of a few eV energy collide with these laser-excited rubidium atoms and excite them further to an upper state n{sup {prime}}L{sup {prime}}J{sup {prime}} from which they decay back to the 5{sup 2}P state. This n{sup {prime}}L{sup {prime}}J{sup {prime}}{r_arrow}5{sup 2}P fluorescence is detected to determine the 5{sup 2}P{sub 3/2,3/2}{r_arrow}6{sup 2}D{sub 3/2,5/2} excitation will be presented.A rubidium beam is intersected at right angles by a cylindrical electron beam and a counterpropagating, circularly polarized diode-laser beam, tuned to the F{sup {prime}} = 3 {r_arrow} F = 4 hyperfine transition of the 5{sup 2}S{sub 1/2} resonance line (780 nm) of {sup 85}Rb. Optical pumping creates {sup 85}Rb 5{sup 2}P atoms in a pure spin and angular momentum state {vert_bar}F=4, M{sub F}=4{r_angle} = {vert_bar}J=3/2, M{sub J}=3/2{r_angle}={vert_bar}M{sub L}=1, M{sub S}=1/2{r_angle}. Electrons of a few eV energy collide with these laser-excited rubidium atoms and excite them further to an upper state n{sup {prime}}L{sup {prime}}J{sup {prime}} from which they decay back to the 5{sup 2}P state. This n{sup {prime}}L{sup {prime}}J{sup {prime}}{r_arrow}5{sup 2}P fluorescence is detected to determine the 5{sup 2}P{sub 3/2,3/2}{r_arrow}6{sup 2}D{sub 3/2,5/2} excitation will be presented.

Bulletin of the American Physical SocietyMay 1, 19930 citations

Radiative lifetimes of the Rb(n 2 F)(n=6, 7, 8) states measured with the stepwise dipole-quadrupole excitation scheme

Jerzy Szonert, B. Bieniak, Małgorzata Głódź +1 more

The European Physical Journal DSep 1, 19955 citations

Laser studies of electronic excitation transfer in atomic calcium: Ca(4s5p /sup 1/P/sub 1/)+Ararrow-right-leftCa(4s5p /sup 3/P/sub 2,1,0/)+Ar

William H. Pence, S.R. Leone

Time-resolved nsec kinetic methods are used to measure state specific electronic excitation transfer for the near-resonant process: Ca(4s5p /sup 1/P/sub 1/) +Ar /sup k//sub 1/arrow-right-left/sub k//sub -/1 Ca(4s5p /sup 3/P/sub 2,1,0/)+Ar. In stimulated emission experiments it is found that the Ca(4s5p /sup 3/P/sub 2/) level is preferentially populated. The rate constant k/sub 1/ for the specific /sup 3/P/sub 2/ channel is 5.2 +- 0.5 x 10/sup -11/ cm/sup 3/ molecule/sup -1/ sec/sup -1/. These results are discussed in terms of near-resonant spin changing collision mechanisms. Radiative lifetimes for Ca(4s5p /sup 1/P/sub 1/) and Ca(4s5p /sup 3/P/sub 1/) are also determined to be 77 +- 2 nsec and 67 +- 2 nsec, respectively.Time-resolved nsec kinetic methods are used to measure state specific electronic excitation transfer for the near-resonant process: Ca(4s5p /sup 1/P/sub 1/) +Ar /sup k//sub 1/arrow-right-left/sub k//sub -/1 Ca(4s5p /sup 3/P/sub 2,1,0/)+Ar. In stimulated emission experiments it is found that the Ca(4s5p /sup 3/P/sub 2/) level is preferentially populated. The rate constant k/sub 1/ for the specific /sup 3/P/sub 2/ channel is 5.2 +- 0.5 x 10/sup -11/ cm/sup 3/ molecule/sup -1/ sec/sup -1/. These results are discussed in terms of near-resonant spin changing collision mechanisms. Radiative lifetimes for Ca(4s5p /sup 1/P/sub 1/) and Ca(4s5p /sup 3/P/sub 1/) are also determined to be 77 +- 2 nsec and 67 +- 2 nsec, respectively.

May 15, 19810 citations

Radiative lifetime measurements of high- $n$ Rb Rydberg states

Duncan Tate, Drew Branden, Tamás Juhász +5 more

Bulletin of the American Physical SocietyJun 6, 20070 citations

Energy transfer in Rb(5~2D_J,7S)+Rb(5S) collisions

Yifan Shen

Rb vapor was irradiated in a glass fluorescence cell with pulses of radiation from a YAG laserpumped OPO laser,populating 5D_j(or 7S) state by two-photon absorption.Energy transfer in Rb (5D_J,7S)+Rb(5S) collision is studied using methods of atomic fluorescence.The resulting fluorescence includes a direct component emitted in the optically excited state decay and a sensitized component arsing. from the collisional populated state.At the different densities of the components,fitting a three-state rate equation model,the cross sectionσ=(3.7±0.9)×10~(-14) cm~2 was obtained for Rb(5D_(5/2))→Rb(5D_(3/2)) transfer.The cross section for excitation transfer out of the 5D_J doublet are(3.1±1.2)×10~(-14) cm~2(for J = 5/2) and(2.0±0.6)×10~(-14) cm~2(for J = 3/2),respectively.The energy transfer cross section for the Rb(5D)→Rb(7S) is small,(1.6±0.4)×10~(-16) cm~2.The 5D_J state is quenched mainly in the reverse energy pooling processes,i.e.Rb(5D_J)+Rb(5S)→Rb(5P)+ Rb(5P).Rb vapor was irradiated in a glass fluorescence cell with pulses of radiation from a YAG laserpumped OPO laser,populating 5D_j(or 7S) state by two-photon absorption.Energy transfer in Rb (5D_J,7S)+Rb(5S) collision is studied using methods of atomic fluorescence.The resulting fluorescence includes a direct component emitted in the optically excited state decay and a sensitized component arsing. from the collisional populated state.At the different densities of the components,fitting a three-state rate equation model,the cross sectionσ=(3.7±0.9)×10~(-14) cm~2 was obtained for Rb(5D_(5/2))→Rb(5D_(3/2)) transfer.The cross section for excitation transfer out of the 5D_J doublet are(3.1±1.2)×10~(-14) cm~2(for J = 5/2) and(2.0±0.6)×10~(-14) cm~2(for J = 3/2),respectively.The energy transfer cross section for the Rb(5D)→Rb(7S) is small,(1.6±0.4)×10~(-16) cm~2.The 5D_J state is quenched mainly in the reverse energy pooling processes,i.e.Rb(5D_J)+Rb(5S)→Rb(5P)+ Rb(5P).

Chinese Journal of Quantum ElectronicsJan 1, 20090 citations

Energy Transfer Between the Zeeman Split Levels of Rb(^2P)

Matthew D. Rotondaro, Glen P. Perram

APSMay 1, 19960 citations