Advances in Atomic, Molecular, and Optical Physics

2'P transition ANGLE deg angular approximation atomic beam Atutov Bederson Berrington buffer gas calculation Chem coherence collisional density density matrix detector detuning Differential cross sections diffusion Doppler drift velocity effect electron beam electron impact electron scattering equations excitation cross sections excited atoms excited-state experimental experiments field flux fragment ions frequency Gel’mukhanov ground ground-state helium hydrogen hyperfine hyperfine structure ICPEAC interaction ionization cross sections isotopic Julienne laser beam laser cooling laser pumping Lett light-induced drift Lignie magnetic matrix metastable metastable atoms method molecular molecules momentum Nienhuis obtained optical parameters particles Phys Rev polarization potential protons pumping quantum R-matrix Rabi frequency rate coefficient region resonance s-wave Shalagin shown in Fig spectral spectrum spontaneous emission superelastic target theory thermal tion Trajmar trap loss two-level two-level atom ultracold velocity distribution velocity-changing collisions wave function