Dejun Yu （Te-tsun Yu, Feb. 1, 1908-July 14, 1986） was a famous plant taxonomist and horticulturist in China as well as an expert on botanical gardens （Fig. 1）. As a patriotic scientist, Dejun Yu refused a position...Dejun Yu （Te-tsun Yu, Feb. 1, 1908-July 14, 1986） was a famous plant taxonomist and horticulturist in China as well as an expert on botanical gardens （Fig. 1）. As a patriotic scientist, Dejun Yu refused a position in Britain and returned to China without hesitation in 1950. He devoted his whole life to the botanical sciences. His contributions went far beyond advancing botany, however, extending to construction of botanical gardens and the exploration of plant resources, especially fruit trees in China. His research was closely connected to the scientific and economic development of his country.展开更多
利用双光子吸收,将Na(3S)原子激发到4D态,测量了Na(4D)+Na(3S)Na(4F)+Na(3S)碰撞能量转移截面,因为直接由4F→3D的荧光不能探测,所以检测3D→3P级联荧光讯号。结合基态钠原子密度的测量,给出了截面值σ_4D→4F=1.3 x 10^(-14)±28...利用双光子吸收,将Na(3S)原子激发到4D态,测量了Na(4D)+Na(3S)Na(4F)+Na(3S)碰撞能量转移截面,因为直接由4F→3D的荧光不能探测,所以检测3D→3P级联荧光讯号。结合基态钠原子密度的测量,给出了截面值σ_4D→4F=1.3 x 10^(-14)±28％(cm^2)。展开更多
文摘Dejun Yu （Te-tsun Yu, Feb. 1, 1908-July 14, 1986） was a famous plant taxonomist and horticulturist in China as well as an expert on botanical gardens （Fig. 1）. As a patriotic scientist, Dejun Yu refused a position in Britain and returned to China without hesitation in 1950. He devoted his whole life to the botanical sciences. His contributions went far beyond advancing botany, however, extending to construction of botanical gardens and the exploration of plant resources, especially fruit trees in China. His research was closely connected to the scientific and economic development of his country.
文摘利用双光子吸收,将Na(3S)原子激发到4D态,测量了Na(4D)+Na(3S)Na(4F)+Na(3S)碰撞能量转移截面,因为直接由4F→3D的荧光不能探测,所以检测3D→3P级联荧光讯号。结合基态钠原子密度的测量,给出了截面值σ_4D→4F=1.3 x 10^(-14)±28％(cm^2)。
