Introducing Ionic-Current Detection for X-ray Absorption Spectroscopy in Liquid Cells.
Daniela SchönJie XiaoRonny GolnakMarc F TeschBernd WinterJuan-Jesus Velasco-VelezEmad F AzizPublished in: The journal of physical chemistry letters (2017)
Photons and electrons are two common relaxation products upon X-ray absorption, enabling fluorescence yield and electron yield detections for X-ray absorption spectroscopy (XAS). The ions that are created during the electron yield process are relaxation products too, which are exploited in this study to produce ion yield for XA detection. The ionic currents measured in a liquid cell filled with water or iron(III) nitrate aqueous solutions exhibit characteristic O K-edge and Fe L-edge absorption profiles as a function of excitation energy. Application of two electrodes installed in the cell is crucial for obtaining the XA spectra of the liquids behind membranes. Using a single electrode can only probe the species adsorbed on the membrane surface. The ionic-current detection, termed as total ion yield (TIY) in this study, also produces an undistorted Fe L-edge XA spectrum, indicating its promising role as a novel detection method for XAS studies in liquid cells.
Keyphrases
- ionic liquid
- high resolution
- solid state
- single molecule
- induced apoptosis
- loop mediated isothermal amplification
- real time pcr
- label free
- cell cycle arrest
- single cell
- stem cells
- dual energy
- nitric oxide
- cell therapy
- magnetic resonance imaging
- cell death
- magnetic resonance
- endoplasmic reticulum stress
- living cells
- computed tomography
- mesenchymal stem cells
- pi k akt
- cell proliferation
- mass spectrometry
- carbon nanotubes
- contrast enhanced
- fluorescent probe