Léonard J, Walhout M, Mosk A P, Müller T, Leduc M, Cohen-Tannoudji C
Ecole Normale Supérieure and Collège de France, Laboratoire Kastler Brossel, 24 rue Lhomond, 75231 Paris CEDEX 05, France.
Phys Rev Lett. 2003 Aug 15;91(7):073203. doi: 10.1103/PhysRevLett.91.073203.
We produce giant, purely long-range helium dimers by photoassociation of metastable helium atoms in a magnetically trapped, ultracold cloud. The photoassociation laser is detuned close to the atomic 2(3)S1-2(3)P0 line and produces strong heating of the sample when resonant with molecular bound states. The temperature of the cloud serves as an indicator of the molecular spectrum. We report good agreement between our spectroscopic measurements and our calculations of the five bound states belonging to a 0(+)(u) purely long-range potential well. These previously unobserved states have classical inner turning points of about 150a(0) and outer turning points as large as 1150a(0).
我们通过在磁阱中超冷云团中对亚稳态氦原子进行光缔合，制备出了巨大的、纯长程氦二聚体。光缔合激光器的失谐接近原子的2(3)S1-2(3)P0线，当与分子束缚态共振时会使样品产生强烈加热。云团的温度可作为分子光谱的一个指标。我们报告了光谱测量结果与我们对属于0(+)(u)纯长程势阱的五个束缚态的计算之间的良好一致性。这些以前未被观测到的态具有约150a(0)的经典内转折点和高达1150a(0)的外转折点。
