Graduate Exam Abstract

Ilya Kuznetsov

Ph.D. Preliminary
May 8, 2015, 10:00 am - 12:00 pm
ERC Electronic Classroom, A210
Nanoscale 3D molecular imaging by extreme ultraviolet laser ablation mass spectrometry

Abstract: Laser ablation and ionization combined with mass spectrometry (MS) forms the basis of one of the most widely exploited analytical tools of the solid state. This work describes the first demonstration of three dimensional (3D) molecular composition imaging with nanoscale spatial resolution by extreme ultraviolet (EUV) laser ablation time of flight (TOF) MS. The essential part of this instrument is a compact capillary discharge EUV laser, developed at Colorado State University, which emits ~10 uJ nanosecond light pulses at a wavelength of 46.9 nm. The use of EUV laser light makes it possible to ablate craters in polymers with diameters as small as 120 nm and depths of 3.5 nm. Both positive and negative ion extraction modes provide single shot detection of intact molecules by probing analyte volumes down to 50 zL. The EUV TOF MS was applied to the chemical analysis of wide range of inorganic and organic compounds, where nanoscale lateral - 75 nm - and depth - 20 nm – resolutions were achieved due to the high sensitivity of the instrument, without compromising mass resolution.

Adviser: Carmen Menoni
Co-Adviser: N/A
Non-ECE Member: Elliot Bernstein, Chemistry
Member 3: Jorge Rocca, ECE, Dean Crick, MIP, Diego Krapf, ECE
Addional Members: N/A

I.Kuznetsov et al., Composition Depth Profiling by Soft X-Ray Laser-Ablation Mass
Spectrometry, Proc. of SPIE Vol. 8849 88490G-1, 2013
I.Kuznetsov et al., Volumetric Composition Imaging by Soft X-Ray Laser Ablation Mass Spectrometry, Proc. of ICXRL'14, in press, 2015
I. Kuznetsov et al., Three-dimensional nanoscale molecular imaging by extreme ultraviolet laser ablation mass spectrometry, Nature Communications, in press, 2015

Program of Study: