Using frequency-chirped radiation pressure slowing, we precisely control the velocity of a pulsed CaF molecular beam down to a few m/s, compressing its velocity spread by a factor of 10 while retaining high intensity: at a velocity of 15 m/s the flux, measured 1.3 m from the source, is 7??10??? molecules per cm?? per shot in a single rovibrational state. The beam is suitable for loading a magneto-optical trap or, when combined with transverse laser cooling, improving the precision of spectroscopic measurements that test fundamental physics. We compare the frequency-chirped slowing method with the more commonly used frequency-broadened slowing method.
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机译：通过降低频率radiation的辐射压力，我们可以将脉冲CaF分子束的速度精确地控制到几m / s，将其速度扩展压缩10倍，同时保持高强度：以15 m / s的速度从源头测得的1.3 m的通量为7 ?? 10？每厘米分子？在单个振动状态下每次射击。该光束适合装载磁光阱，或者与横向激光冷却结合使用时，可提高光谱测试的精度，以测试基础物理。我们将调频减慢方法与更常用的扩频减慢方法进行了比较。
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