BibTex format
@article{Hori:1998,
author = {Hori, M and Torii, HA and Hayano, RS and Ishikawa, T and Maas, FE and Tamura, H and Ketzer, B and Hartmann, FJ and Pohl, R and Maierl, C and Hasinoff, M and Von, Egidy T and Kumakura, M and Morita, N and Sugai, I and Horváth, D and Widmann, E and Eades, J and Yamazaki, T},
journal = {Physical Review A - Atomic, Molecular, and Optical Physics},
pages = {1613--1627},
title = {Laser spectroscopic studies of state-dependent collisional quenching of the lifetimes of metastable antiprotonic helium atoms},
volume = {58},
year = {1998}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - A laser spectroscopic method was developed to directly observe the lifetimes of individual states in metastable antiprotonic helium atoms (p 4He+). Collisional effects with surrounding helium atoms were studied in cryogenic gas targets at pressures between 0.1 and 9.0 bars and at temperatures between 5.5 and 7.0 K. The metastable state (n, l) = (39,35) showed a lifetime of 1.5 μs, regardless of density, whereas the lifetime of the energetically lower-lying state (37,34) was found to shorten from 1.3 to 0.1 μs with increasing density. The lifetimes of the states (38,34) and (36,33) were determined to be 10 ns and 5 ns, respectively, showing the effects of the internal Auger process. When extrapolated to zero density, the measured lifetimes agreed with the results of calculations for the radiative and Auger widths. Using the fact that the state (37,34) becomes short lived at high density, the resonance (38,35)→(37,34) at a wavelength of 529.62 nm was detected.
AU - Hori,M
AU - Torii,HA
AU - Hayano,RS
AU - Ishikawa,T
AU - Maas,FE
AU - Tamura,H
AU - Ketzer,B
AU - Hartmann,FJ
AU - Pohl,R
AU - Maierl,C
AU - Hasinoff,M
AU - Von,Egidy T
AU - Kumakura,M
AU - Morita,N
AU - Sugai,I
AU - Horváth,D
AU - Widmann,E
AU - Eades,J
AU - Yamazaki,T
EP - 1627
PY - 1998///
SN - 1050-2947
SP - 1613
TI - Laser spectroscopic studies of state-dependent collisional quenching of the lifetimes of metastable antiprotonic helium atoms
T2 - Physical Review A - Atomic, Molecular, and Optical Physics
VL - 58
ER -