scholarly journals Ultrafast photoisomerisation of an isolated retinoid

2019 ◽  
Vol 21 (20) ◽  
pp. 10567-10579 ◽  
Author(s):  
James N. Bull ◽  
Christopher W. West ◽  
Cate S. Anstöter ◽  
Gabriel da Silva ◽  
Evan J. Bieske ◽  
...  
Keyword(s):  
Retinoic Acid ◽  
Excited State ◽  
Gas Phase ◽  
Laser Spectroscopy ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Photoelectron Imaging ◽  
Time Resolved ◽  
Excited State Dynamics

The photoinduced excited state dynamics of gas-phase trans-retinoate (deprotonated trans-retinoic acid, trans-RA−) are studied using tandem ion mobility spectrometry coupled with laser spectroscopy, and frequency-, angle- and time-resolved photoelectron imaging.

scholarly journals Excited state dynamics of molecules studied with femtosecond time-resolved mass spectrometry and photoelectron imaging

2018 ◽  
Vol 67 (22) ◽  
pp. 227802
Author(s):  
Wang Yan-Mei ◽  
Tang Ying ◽  
Zhang Song ◽  
Long Jin-You ◽  
Zhang Bing
Keyword(s):  
Mass Spectrometry ◽  
Excited State ◽  
Photoelectron Imaging ◽  
Time Resolved ◽  
Excited State Dynamics

Excited-state dynamics of guanosine in aqueous solution revealed by time-resolved photoelectron spectroscopy: experiment and theory

2015 ◽  
Vol 17 (47) ◽  
pp. 31978-31987 ◽  
Author(s):  
Franziska Buchner ◽  
Berit Heggen ◽  
Hans-Hermann Ritze ◽  
Walter Thiel ◽  
Andrea Lübcke
Keyword(s):  
Aqueous Solution ◽  
Excited State ◽  
Photoelectron Spectroscopy ◽  
Relaxation Dynamics ◽  
Time Resolved ◽  
Excited State Dynamics ◽  
Spectroscopy Experiment

Time-resolved photoelectron spectroscopy is performed on aqueous guanosine solution to study its excited-state relaxation dynamics.

scholarly journals Ion Mobility Spectrometry-Mass Spectrometry (IMS-MS) for on- and off-line analysis of atmospheric gas and aerosol species

2016 ◽  
Author(s):  
Jordan E. Krechmer ◽  
Michael Groessl ◽  
Xuan Zhang ◽  
Heikki Junninen ◽  
Paola Massoli ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Measurement Techniques ◽  
Molecular Ions ◽  
Molecular Structures ◽  
Water Soluble ◽  
Oxidation Products ◽  
Time Resolved ◽  
Organic Species

Abstract. Measurement techniques that provide molecular-level information are needed to elucidate the multi-phase processes that produce secondary organic aerosol (SOA) species in the atmosphere. Here we demonstrate the application of ion mobility spectrometry-mass spectrometry (IMS-MS) to the simultaneous characterization of the elemental composition and molecular structures of organic species in the gas and particulate phases. Molecular ions of gas-phase organic species are measured online with IMS-MS after ionization with a custom build nitrate chemical ionization (CI) source. This CI-IMS-MS technique is used to obtain time-resolved measurements (5 min) of highly oxidized organic molecules during the 2013 Southern Oxidant and Aerosol Study (SOAS) ambient field campaign in the forested SE US. The ambient IMS-MS signals are consistent with laboratory IMS-MS spectra obtained from single-component carboxylic acids and multicomponent mixtures of isoprene and monoterpene oxidation products. Mass-mobility correlations in the 2-dimensional IMS-MS space provide a means of identifying ions with similar molecular structures within complex mass spectra and are used to separate and identify monoterpene oxidation products in the ambient data that are produced from different chemical pathways. Water-soluble organic carbon (WSOC) constituents of fine aerosol particles that are not resolvable with standard analytical separation methods, such as liquid chromatography (LC), are shown to be separable with IMS-MS coupled to an electrospray ionization (ESI) source. The capability to use ion mobility to differentiate between isomers is demonstrated for organosulfates derived from the reactive uptake of isomers of isoprene epoxydiols (IEPOX) onto wet acidic sulfate aerosol. Controlled fragmentation of precursor ions by collisional dissociation (CID) in the transfer region between the IMS and the MS is used to validate MS peak assignments, elucidate structures of oligomers, and confirm the presence of the organosulfate functional group.

scholarly journals Gas Phase Stability of Protein Ions in a Cyclic Ion Mobility Spectrometry Traveling Wave Device

2019 ◽  
Vol 91 (12) ◽  
pp. 7554-7561 ◽  
Author(s):  
Charles Eldrid ◽  
Jakub Ujma ◽  
Symeon Kalfas ◽  
Nick Tomczyk ◽  
Kevin Giles ◽  
...  
Keyword(s):  
Gas Phase ◽  
Ion Mobility Spectrometry ◽  
Phase Stability ◽  
Ion Mobility ◽  
Traveling Wave ◽  
Protein Ions ◽  
Wave Device
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