Multiphoton Spectroscopy of Small Molecules and Atomic Helium (Physics)

简单原子的高分辨测量程序 和分子将继续，特别关注 氢分子和氦原子的双电子系统。 实验方法包括多光子激发 包括基态和亚稳态物质。 脉冲放大连续波 染料激光器用于获得所需的高功率， 多光子激发，同时保持高分辨率。 的 氢的离解能和电离势 将被确定到一个新的精度，并改善测量将 由氦的结构组成。 这些测量将 提供了量子计算的第一个严格测试， 双电子基态电动力学效应 系统. 微波-光学双共振将用于 精确测量高里德伯态之间的跃迁。 这项研究的一个主要重点是 氢的激发态与电离和离解 连续性，包括双激发态的影响。 的 里德伯态的衰变将研究有和没有 外部电场。 工作将继续进行， 氢的光解离非常接近阈值，这产生 原子间长程相互作用的详细信息。

A program of high resolution measurements on simple atoms and molecules will be continued, concentrating especially on the two-electron systems molecular hydrogen and atomic helium. The experimental methods involve multiphoton excitation of both ground state and metastable species. A pulse-amplified cw dye laser is used to obtain the high powers required for multiphoton excitation while retaining high resolution. The dissociation energy and ionization potential of hydrogen will be determined to a new accuracy, and improved measurements will be made of the structure of helium. These measurements will provide the first stringent tests of calculations of quantum electrodynamic effects in the ground states of two-electron systems. Microwave-optical double resonance will be used to precisely measure transitions between high Rydberg states. A major focus on this research will be the interaction of excited states in hydrogen with the ionization and dissociation continua, including the effects of doubly excited states. The decay of Rydberg states will be studied both with and without external electric fields. Work will continue on the photodissociation of hydrogen very near threshold, which yields detailed information on long-range interactions between atoms.