Work

A liquid surface height controller for surface spectroscopy

Year: 2021

Type: article

Abstract: We present a simple and inexpensive liquid surface height controller that can monitor and maintain the height of a liquid surface in a surface-sensitive experiment. The system is based on a commercial laser pointer, universal serial bus webcam, syringe pump, and homemade control software. The system can sense changes in the height of the surface of ±1 µm, and the maximum range of the device without readjustment is around 2.5 mm. The intended use of the device is to maintain the height of a sample at the air-water interface in a sum-frequency generation spectroscopy measurement, which constantly changes due to water evaporation. A demonstration of the system maintaining the height of a water surface to a tolerance of ±5 µm over a period of 8 h is shown to illustrate the stability of a system controlled by this device.

Source: Review of Scientific Instruments

DOI: 10.1063/5.0057849

Authors: James D. Pickering, Adam S. Chatterley, Mikkel Bregnhøj, Tobias Weidner

Institution: Aarhus University

Language: English

Topic: Spectroscopy and Quantum Chemical Studies

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Funders: Villum Fonden, Novo Nordisk Fonden

Awards: G1755809610, G3674958448, G4754451607