A bright, slow cryogenic molecular beam source for free radicals.
A bright, slow cryogenic molecular beam source for free radicals.
复制标题
DOI：
10.1039/c1cp20335e
复制
发表时间：
2011-01
期刊：
影响因子：
--
通讯作者：
John Barry;Edward Shuman;D. DeMille
中科院分区：
文献类型：
--
作者：
John Barry;Edward Shuman;D. DeMille
我们展示和表征低温缓冲气体冷却分子束源能够产生明亮的光束的自由基和难熔物种。详细的光束特性（亮度，前向速度分布，横向速度分布，旋转和振动温度）的测量在不同的条件下的分子物种SrF。在典型的条件下，我们产生了X（2）π（+）（v = 0，N（rot）= 0）态的亮度为1.2 × 10（11）个分子/sr/脉冲，前向速度为140（m/s），转动温度为101 K的光束。这种来源相比，有利的其他方法产生束的自由基和难熔物种的许多类型的实验。我们提供的构造细节可能对尝试使用此方法的其他人有所帮助。
We demonstrate and characterize a cryogenic buffer gas-cooled molecular beam source capable of producing bright beams of free radicals and refractory species. Details of the beam properties (brightness, forward velocity distribution, transverse velocity spread, rotational and vibrational temperatures) are measured under varying conditions for the molecular species SrF. Under typical conditions we produce a beam of brightness 1.2 × 10(11) molecules/sr/pulse in the X(2)Σ(+)(v = 0, N(rot) = 0) state, with 140(m/s) forward velocity and a rotational temperature of ≈ 1 K. This source compares favorably to other methods for producing beams of free radicals and refractory species for many types of experiments. We provide details of construction that may be helpful for others attempting to use this method.