ULTRAVIOLET INTRACAVITY LASER ABSORPTION SPECTROSCOPY

Zamir, Uri

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https://hdl.handle.net/2142/122320 Copy

Description

Title

ULTRAVIOLET INTRACAVITY LASER ABSORPTION SPECTROSCOPY

Author(s)

Zamir, Uri

Contributor(s)

• Baraban, Joshua H.
• Rahinov, Igor
• Kaplan, Amir
• Kalisky, Yehoshua
• Lerer, Avi
• Rozenberg, Illya
• Cohen, Maayan

Issue Date

2023-06-20

Keyword(s)

• Electronic structure
• potential energy surfaces

Abstract

Intracavity Laser Absorption Spectroscopy (ICAS) provides an excellent solution for ultrasensitive, multiplexed, quantitative detection of reactive species, but has traditionally been limited to the visible and infrared spectral regions by the requirement for direct broadband lasing media. We report the first realization of this technique in the ultraviolet (UV-ICAS), based on a home-built Ce:LiCAF laser that operates in the 280-316 nm range. Three key species were investigated using our prototype UV-ICAS spectrometer: formaldehyde, sulfur dioxide, and hydroxyl radical. Successful initial measurements of static gases (the formaldehyde A˜¹A₂ − X˜¹A₁ electronic transition and the sulfur dioxide X˜¹B₂ − B˜¹A₁ electronic transition) led us to record in situ the A²Σ⁺ − X²Π spectrum of hydroxyl radical in a butane flame. Comparison of the latter to a LIFBASE simulation allowed single shot extraction of the temperature of hydroxyl radicals in the flame, demonstrating the data acquisition efficiency of UV-ICAS. We will also discuss the technique’s potential for novel ultrasensitive, high resolution, broadband spectroscopy.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122320

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