# Microwave trap for atoms and molecules

## TL;DR

This paper introduces a microwave trap that confines polarizable atoms and molecules using a standing-wave microwave field, enabling trapping of ground states with potential for cooling techniques.

## Contribution

The authors demonstrate a novel microwave trap that can confine a wide range of atoms and molecules based solely on polarizability, with detailed measurements of trap properties.

## Key findings

- Trap volume of about 10 cm$^3$
- Trap depth approaching 1 K for many molecules
- Li atom lifetime of 1.76 seconds at 610 W power

## Abstract

We demonstrate a trap that confines polarizable particles around the antinode of a standing-wave microwave field. The trap relies only on the polarizability of the particles far from any resonances, so can trap a wide variety of atoms and molecules in a wide range of internal states, including the ground state. The trap has a volume of about 10 cm$^3$, and a depth approaching 1 K for many polar molecules. We measure the trap properties using $^{7}$Li atoms, showing that when the input microwave power is 610 W, the atoms remain trapped with a $1/e$ lifetime of 1.76(12) s, oscillating with an axial frequency of 28.55(5) Hz and a radial frequency of 8.81(8) Hz. The trap could be loaded with slow molecules from a range of available sources, and is particularly well suited to sympathetic cooling and evaporative cooling of molecules.