Optical pumping of Rb in the presence of high-pressure 3He buffer gas.
Optical pumping of Rb in the presence of high-pressure 3He buffer gas.
复制标题
在高压 3He 缓冲气体存在下对 Rb 进行光泵浦。
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
Thiessen
中科院分区：
文献类型：
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作者：
Larson;Häusser;Delheij;Whittal;Thiessen
低温技术已被用于生产极化$^{3}mathrm{He}$靶，相对密度p=12 atm （ensuremath{approxeq}3ifmmode imeselse exttimesfi{}${10}^{20}$ $ $^{3}mathrm{He}$原子/${mathrm{cm}}^{3}$; p=1 atm对应于760 Torr或273 K时的101.3 kPa压力）。在这些目标中，{He}$原子核通过与光泵浦铷原子的自旋交换碰撞而发生极化。从波长790char21{}800 nm的透射测量中，我们确定了Rb 5${mathit{S}}_{1/2}$ensuremath{
rightarrow}5${mathit{P}}_{1/2}$ D1跃迁的压力位移、线宽和线形不对称。Rb的自旋破坏速率随$^{3}mathrm{He}$压力呈二次增长，说明Rb${mathrm{ensuremath{-}}}^{3}$He${mathrm{ensuremath{-}}}^{3}$He碰撞过程的重要性。圆偏振光的透射结果被一个模型很好地描述，该模型预测了Rb平均偏振与Rb密度、数学{He}$压力、光强和电池几何形状的关系。Rb${mathrm{ensuremath{-}}}^{3}$He自旋交换截面< ${mathrm{ensuremath{sigma}}}_{mathrm{SE}}$v > =6.1ifmmode imeselse exttimesfi{}${10}^{mathrm{ensuremath{-}}20}$ ${mathrm{cm}}^{3}$ ${mathrm{s}}^{mathrm{ensuremath{-}}1}$与$^{3}mathrm{He}$压力无关，p=12.1 atm。在p=6char21{}9 atm处，含有$^{3}mathrm{He}$的17 ${mathm {cm}}^{3}$体积的细胞，最大$^{3}mathm {He}$极化为72char21{}79%。
A cryogenic technique has been used to produce polarized $^{3}mathrm{He}$ targets of up to relative density p=12 atm (ensuremath{approxeq}3ifmmode imeselse exttimesfi{}${10}^{20}$ $^{3}mathrm{He}$ atoms/${mathrm{cm}}^{3}$; p=1 atm corresponds to 760 Torr or 101.3 kPa pressure at 273 K). In these targets $^{3}mathrm{He}$ nuclei are polarized by spin-exchange collisions with optically pumped rubidium atoms. From transmission measurements at wavelengths of 790char21{}800 nm, we have determined pressure shifts, linewidths, and line-shape asymmetries for the Rb 5${mathit{S}}_{1/2}$ensuremath{
ightarrow}5${mathit{P}}_{1/2}$ D1 transition. The Rb spin-destruction rate was found to exhibit a quadratic increase versus $^{3}mathrm{He}$ pressure, which indicates the importance of Rb${mathrm{ensuremath{-}}}^{3}$He${mathrm{ensuremath{-}}}^{3}$He collision processes. The transmission results for circularly polarized light are well described by a model that predicts the dependence of the average Rb polarization on Rb density, $^{3}mathrm{He}$ pressure, light intensity, and cell geometry. The Rb${mathrm{ensuremath{-}}}^{3}$He spin-exchange cross section, 〈${mathrm{ensuremath{sigma}}}_{mathrm{SE}}$v〉=6.1ifmmode imeselse exttimesfi{}${10}^{mathrm{ensuremath{-}}20}$ ${mathrm{cm}}^{3}$ ${mathrm{s}}^{mathrm{ensuremath{-}}1}$, was found to be independent of $^{3}mathrm{He}$ pressure up to p=12.1 atm. Maximum $^{3}mathrm{He}$ polarizations of 72char21{}79% were observed with cells of 17 ${mathrm{cm}}^{3}$ volume that contained $^{3}mathrm{He}$ at p=6char21{}9 atm.