Papers

publications

Spectral proximity network of the partially averaged mass spectrometric image (40′000 mass spectra 260 single unit masses). The networks are colored according to the node degree (the degree of a node is the number of edges connected to the node). Paper / PDF TL;DR In this paper we present: a multi-element imaging of the Gunflint chert (2 billions years old) sample; the unsupervised analysis of 40′000 mass spectra, downsampled from 100'000 spectral databank, using nonlinear reduction and topological coarsening....

Paper / PDF TL;DR In this paper we present: Chemical depth profiles from the highly heterogeneous media (amygdale calcium carbonate embedded in the surrounding basalt) The presence of oxides and sulphides within inclusion material allows us to derive elemental abundance calibration factors With the RSCs corrections the quantitative analysis of more complex mineralogical phases within the inclusion is conducted by correlating atomic abundance fractions in ternary diagrams Stoichiometric abundances can be reconstructed using our method

Simplified schematics of the multi-color ion generation and mass separation using fs-LIMS instrument. Paper / PDF TL;DR In this paper we present: installation of beta-barium borate crystals into beam delivery line (we’ve build a new ultrafast optics line to achieve that), with doubling and tripling capabilities that allowed us to reach stable (power jitter below 1% shot-to-shot) and powerful (multifold above ionization threshold) far-UV fs-emission We use a clear Precambrian chert (mainly SiO2/glass with inclusions of absorptive kerogenous matter) as a testbed for new laser frequencies Change from IR-775 nm to UV-258 nm allowed us to increase the 1) mass-resolution of measured mass spectra by a factor 10, and 2) increase the total ion-yield by a factor of 10 and significantly decrease the dispersion, thus, allowing to collect mass spectrometric signals agnostic of any heterogeneity of analyte material we also present a very fast HV-module, that removes abundant ions of choice on the way to the detector, that allowed to increase the detection range by a factor of 5-7 this is all achieved with coffee-cup sized mass spectrometer developed for in-situ space measurements on the Moon, Mars, Europe etc....

A randomly selected subset (70%) of spectral similarity networks used for an estimation of the robustness of the covering algorithm. A 92% Rand Index shows that network can be confidently segregated into two communities. Paper / PDF TL;DR In this paper we present: a large-scale time-of-flight mass-spectra collection using the tiny space-type mass spectrometer a new preprocessing routines for robust baseline removal, noise suppression and spot-to-spot time-of-flight calibration. Overall we achieved a stunning 2 orders of magnitude SNR improvement over the raw spectra and large-scale baseline stability that showed no significant over and undershoots (thus, no artefactual variance in the processed data)....

Ion yields measured from the two-entity inclusion extracted from the chemical depth profile. Color groupings identifies elements with high affinity (i.e., CH-rich kerogen and silicate chert. Molecular ions loosely connected on the sides identifies the plasma chemistry byproducts originated on the way to the detector. Second image - decision borderlines on PCA reduced spectra. Paper / PDF TL;DR In this paper we present: weighted mass correlation networks (WMCN) identified for inclusions in the bulk of the analyte material sliding window centrality measure and a divergence of the modularity score on spots with more that one chemical entities present kernel density estimation on ion-intensity regions for specific compounds Van-Krevelen metric for organic vs....

In this paper we show that with our new mass spectrometry system we can detect very low abundances of organic molecules. To be precise - in the femtomole/mm-2 range - which is a billionth of a millionth (10-15) of a mole (however, it’s still quite a lot of molecules!) Paper / PDF TL;DR In this paper we present: a description of a novel analytical technique for the detection of extremely low concentrations of amino acids called ORIGIN, a compact and lightweight laser desorption ionization – mass spectrometer designed and developed for in situ space exploration missions....