与Na（4d）—Na（4f）碰撞能量转移相关联的两步混合激发四波混频

沈异凡, 李万兴, 普拉提·艾合买提

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σ４Ｄ→４Ｆ－１．３×１０＾－１４±２８％（ｃｍ＾２）。

王骐, 邢达, Wei Liu +2 more

本文报道了用共振泵浦Na（3P）态，通过Na（3P）＋Na（3S）复合而获得Na2（b^3∑g^＋）态粒子数布居的可能，以及用双光子共振泵浦Na（4D）态获得b^3∑g^＋-x^3∑u^3受激发射。

ShenYi-Fan, LiWan-Xing

Cross section σ4D→4F was measured for the collision transfer process of Na(4D) +Na(3S)→Na(4F)+Na(3S).The 4D state is excited by two-photon absorption using a tunable dye laser.Since the 4F→3D fluorescence can not be detected directly with the apparatus used the cascade 3D→3P fluorescence is monitored instead.Then the cross-section σ4D→4F=(1.3±0.3)×10^-14cm^2 is got from the relative intensity of the fluorescence.A theoretical evaluation of σ4D→4F is also given and compared with experimental results.

沈异凡, 李万兴

置于同一池中的钠原子和铷原子，分别被连续染料激光器和铷光谱灯激发到Ｎａ（３Ｐ），Ｒｂ（５Ｐ），Ｎａ（３Ｐ）原子密度由吸收等效宽度技术测定，利用调制技术分离出了凡异核碰撞产生的荧光光谱，观察到了Ｎａ（３Ｐ）和Ｒｂ（５Ｐ）间的碰撞能量俣并现象，并测定了其碰撞截面。

LI WAN-XING

We measured the cross section for the collision transfer process Na(4D)+Na (3S)Na(4F)+Na(3S). The 4D state was excited by two photon absorption using a tunable dye laser. Since the direct 4F→3D fluorescence can not be detected with our apparatus, we monitored instead the cascade 3D→3P and 4D→3P fluorescence. Relative intensity of the fluorescence, combined with the measurement of sodium density, yielded cross section σ_(4D)→(4F)=1.3×10~(-14)±28％(cm~2). Our result is compared to other experiments.

常鑫鑫, 沈礼, 杨玉娜 +1 more