Spectroscopy of molecules in very high rotational states using an optical centrifuge.
Spectroscopy of molecules in very high rotational states using an optical centrifuge.
复制标题
使用光学离心机对极高旋转状态下的分子进行光谱分析。
作者：
Liwei Yuan;C. Toro;Morag Bell;A. Mullin
我们开发了一种高功率光学离心机，用于测量极端旋转状态下分子的光谱。光学离心机的脉冲能量比以前的仪器大2个数量级以上。大的脉冲能量使我们能够驱动大量的分子密度到极端的旋转状态，以测量传统方法无法实现的新的光谱跃迁。在这里，我们演示了使用光学离心机来测量N2O从状态的红外跃迁，直到现在还无法进入。在这些研究中，光学离心机驱动N2O分子进入J ~ 200的状态，我们使用高分辨率瞬态红外探测来测量由于离心分子碰撞冷却而导致的J = 93-99状态下的人口外观。高分辨率多普勒扩宽线剖面测量得到关于光学离心机旋转和平移能量分布的信息。
We have developed a high power optical centrifuge for measuring the spectroscopy of molecules in extreme rotational states. The optical centrifuge has a pulse energy that is more than 2 orders of magnitude greater than in earlier instruments. The large pulse energy allows us to drive substantial number densities of molecules to extreme rotational states in order to measure new spectroscopic transitions that are not accessible with traditional methods. Here we demonstrate the use of the optical centrifuge for measuring IR transitions of N2O from states that have been inaccessible until now. In these studies, the optical centrifuge drives N2O molecules into states with J ~ 200 and we use high resolution transient IR probing to measure the appearance of population in states with J = 93-99 that result from collisional cooling of the centrifuged molecules. High resolution Doppler broadened line profile measurements yield information about the rotational and translational energy distributions in the optical centrifuge.