In High Kinetic Energy Ion Mobility Spectrometry (HiKE-IMS), ions are formed in a reaction region and separated in a drift region, which is similar to classical drift tube ion mobility spectrometers (IMS) operated at ambient pressure. However, in contrast to the latter, the HiKE-IMS is operated at a decreased background pressure of 10-40 mbar and achieves high reduced electric field strengths of up to 120 Td in both the reaction and the drift region. Thus, the HiKE-IMS allows insights into the chemical kinetics of ion-bound water cluster systems at effective ion temperatures exceeding 1000 K, although it is operated at the low absolute temperature of 45 °C. In this work, a HiKE-IMS with a high resolving power of = 140 is used to study the dependence of reduced ion mobilities on the drift gas humidity and the effective ion temperature for the positive reactant ions HO(HO), O(HO), NO(HO), NO(HO), and NH(HO), as well as the negative reactant ions O(HO), O(HO), CO(HO), HCO(HO), and NO(HO). By varying the reduced electric field strength in the drift region, cluster transitions are observed in the ion mobility spectra. This is demonstrated for the cluster systems HO(HO) and NO(HO).
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/jasms.0c00280 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Ionic Crosslinking of Linear Polyethyleneimine Hydrogels with Tripolyphosphate.
Gels
December 2024
Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Ciencias Químicas, Ciudad Autónoma de Buenos Aires 1113, Argentina.
In this work, the mechanical properties of hydrogels based on linear polyethyleneimine (PEI) chemically crosslinked with ethyleneglycoldiglycidyl ether (EGDE) were improved by the ionic crosslinking with sodium tripolyphosphate (TPP). To this end, the quaternization of the nitrogen atoms present in the PEI structure was conducted to render a network with a permanent positive charge to interact with the negative charges of TPP. The co-crosslinking process was studied by H high-resolution magic angle spinning (H HRMAS) NMR and X-ray photoelectron spectroscopy (XPS) in combination with organic elemental analysis and inductively coupled plasma mass spectrometry (ICP-MS).
View Article and Find Full Text PDFProbing ionic conductivity and electric field screening in perovskite solar cells: a novel exploration through ion drift currents.
Energy Environ Sci
December 2024
Department of Physics, University of Oxford, Clarendon Laboratory Oxford OX1 3PU UK
It is widely accepted that mobile ions are responsible for the slow electronic responses observed in metal halide perovskite-based optoelectronic devices, and strongly influence long-term operational stability. Electrical characterisation methods mostly observe complex indirect effects of ions on bulk/interface recombination, struggle to quantify the ion density and mobility, and are typically not able to fully quantify the influence of the ions upon the bulk and interfacial electric fields. We analyse the bias-assisted charge extraction (BACE) method for the case of a screened bulk electric field, and introduce a new characterisation method based on BACE, termed ion drift BACE.
View Article and Find Full Text PDFNon-destructive detection strategy of maize seed vigor based on seed phenotyping and the potential for accelerating breeding.
J Adv Res
December 2024
College of Agronomy and Biotechnology, China Agricultural University/ The Innovation Center (Beijing) of Crop Seeds Whole-Process Technology Research of Ministry of Agriculture and Rural Affairs/ Beijing Key Laboratory of Crop Genetic Improvement, Beijing 100193, China. Electronic address:
Article Synopsis
- Seeds are vital for agricultural success, influencing seedling quality and crop yields, making accurate vigor assessment essential for productivity.
- The study seeks to create a non-destructive method to evaluate maize seed vigor, overcoming the limitations of traditional testing methods, by using a large set of maize inbred lines and advanced technologies like machine vision and hyperspectral imaging.
- The findings indicate that machine vision is the most effective method for seed vigor detection with about 90% accuracy, and it also uncovers key genetic and metabolic traits linked to seed germination, providing insights into improving seed vigor in maize.
Dynamic effects of ultrasonic treatment on flavor and metabolic pathway of pumpkin juice during storage based on GC-MS and GC-IMS.
Food Chem
December 2024
School of Life Science, Jiangxi Science &Technology Normal University, Nanchang 330013, China.
In this study, the dynamic effects of ultrasonic treatment (0-400 W) on the volatile flavor compounds of pumpkin juice under different storage periods were investigated systematically using a combination of headspace solid-phase microextraction gas chromatography-mass spectrometry (HS-SPME-GC-MS) and gas chromatography-ion mobility spectrometry (GC-IMS) techniques. A total of 139 and 46 volatile organic compounds (VOCs) were identified by GC-MS and GC-IMS, respectively. The results indicated that complex changes in volatile components occurred during storage.
View Article and Find Full Text PDFSelective Reduction of Esters to Access Aldehydes Using Fiddler Crab-Type Boranes.
J Am Chem Soc
December 2024
Organocatalysis Research Group, Institute of Organic Chemistry, HUN-REN Research Centre for Natural Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary.
The partial reduction of esters to aldehydes is a fundamentally important transformation for the synthesis of numerous fine chemicals and consumer goods. However, despite the many efforts, limitations have persisted, such as competing overreduction, low reproducibility, use of exigent reaction conditions and hazardous chemicals. Here, we report a novel catalyst family with a unique steric design which promotes the catalytic partial reduction of esters with unprecedented, near-perfect selectivity and efficiency.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!