Department of Physics, Yale University, PO Box 208120, New Haven, CT 06520, USA.
Phys Chem Chem Phys. 2011 Nov 14;13(42):18936-47. doi: 10.1039/c1cp20335e. Epub 2011 Jun 24.
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.
我们展示并描述了一种低温缓冲气体冷却的分子束源，该源能够产生明亮的自由基和难熔物质束。在不同条件下，详细测量了 SrF 分子的束特性（亮度、前向速度分布、横向速度展宽、旋转和振动温度）。在典型条件下，我们在 X(2)Σ(+)(v = 0, N(rot) = 0)态下产生了亮度为 1.2×10(11)分子/sr/pulse 的束，前向速度为 140(m/s)，旋转温度约为 1 K。与其他用于产生自由基和难熔物质束的方法相比，这种源在许多实验类型中都具有优势。我们提供了可能对其他尝试使用这种方法的人有帮助的构造细节。
