Imaging of supersonically expanded and pulsed molecular beams by nonlinear photoionization processes

Watheq Al-Basheer

doi:10.1117/12.2306512

24 May 2018 Imaging of supersonically expanded and pulsed molecular beams by nonlinear photoionization processes

Watheq Al-Basheer

Proceedings Volume 10677, Unconventional Optical Imaging; 106773L (2018) https://doi.org/10.1117/12.2306512
Event: SPIE Photonics Europe, 2018, Strasbourg, France

Abstract

In molecular spectroscopy, imaging of supersonically expanded and jet-cooled molecular pulses to evaluate their time of flight and velocity is useful in obtaining photoionization spectra of higher resolution, well-resolved, and enhanced signal to noise ratio. In this paper, the ultraviolet output of frequency doubled OPO laser at 266 nm was employed to obtain highly-resolved (2+1) resonance-enhanced multiphoton ionization (REMPI) spectra for cooled molecular pulses of methyl iodide (CH₃I) sample seeded in helium gas. The recorded photoionization spectra were manipulated to study the shape, duration and structure of the jet cooled molecular beam pulses. A two meter time- of- flight (TOF) mass spectrometer was employed to identify and record the ions produced while varying the time delay between molecular pulses and laser shots. Imaging of CH₃I molecular pulses yielded lorentzian distributions of full width at base and flight time peak location corresponding to pulses duration of ~ 0.3 milliseconds and 931 m/s cooled molecules translational velocity, respectively.

Citation Download Citation

Watheq Al-Basheer "Imaging of supersonically expanded and pulsed molecular beams by nonlinear photoionization processes", Proc. SPIE 10677, Unconventional Optical Imaging, 106773L (24 May 2018); https://doi.org/10.1117/12.2306512

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available