scholarly journals High-resolution double resonance action spectroscopy in ion traps: vibrational and rotational fingerprints of CH2NH2+

2019 ◽  
Vol 21 (48) ◽  
pp. 26406-26412 ◽  
Author(s):  
Charles R. Markus ◽  
Sven Thorwirth ◽  
Oskar Asvany ◽  
Stephan Schlemmer
Keyword(s):  
High Resolution ◽  
Ion Trap ◽  
Double Resonance ◽  
Ion Traps ◽  
Rotational Transition ◽  
Action Spectroscopy

A novel rotation–vibration double resonance scheme was used to measure the first pure rotational transition frequencies of protonated methanimine (CH2NH2+) in a 4 K cryogenic ion trap.

Numerical analysis of trajectories in a Cassinian ion trap of second order with trap door ion inlet

2021 ◽  
Vol 27 (1) ◽  
pp. 3-12
Author(s):  
Bjoern Raupers ◽  
Hana Medhat ◽  
Juergen Grotemeyer ◽  
Frank Gunzer
Keyword(s):  
Ion Trap ◽  
Ion Traps ◽  
Second Order ◽  
Resolving Power ◽  
Periodic Pattern ◽  
Ion Motion ◽  
Trap Door ◽  
Mass Resolving Power ◽  
Long Time ◽  
The Fourier Transform

Ion traps like the Orbitrap are well known mass analyzers with very high resolving power. This resolving power is achieved with help of ions orbiting around an inner electrode for long time, in general up to a few seconds, since the mass signal is obtained by calculating the Fourier Transform of the induced signal caused by the ion motion. A similar principle is applied in the Cassinian Ion Trap of second order, where the ions move in a periodic pattern in-between two inner electrodes. The Cassinian ion trap has the potential to offer mass resolving power comparable to the Orbitrap with advantages regarding the experimental implementation. In this paper we have investigated the details of the ion motion analyzing experimental data and the results of different numerical methods, with focus on increasing the resolving power by increasing the oscillation frequency for ions in a high field ion trap. In this context the influence of the trap door, a tunnel through which the ions are injected into the trap, on the ion velocity becomes especially important.

Demystifying the Diffuse Vibrational Spectrum of Aqueous Protons Through Cold Cluster Spectroscopy

2021 ◽  
Vol 72 (1) ◽  
Author(s):  
Helen J. Zeng ◽  
Mark A. Johnson
Keyword(s):  
Double Resonance ◽  
Ion Traps ◽  
Cryogenic Cooling ◽  
Annual Review ◽  
Resonance Spectroscopy ◽  
Publication Date ◽  
Relaxation Dynamics ◽  
Acid Dissolution ◽  
Complex Species ◽  
Charge Translocation

The ease with which the pH is routinely determined for aqueous solutions masks the fact that the cationic product of Arrhenius acid dissolution, the hydrated proton, or H+(aq), is a remarkably complex species. Here, we review how results obtained over the past 30 years in the study of H+⋅(H2O) n cluster ions isolated in the gas phase shed light on the chemical nature of H+(aq). This effort has also revealed molecular-level aspects of the Grotthuss relay mechanism for positive-charge translocation in water. Recently developed methods involving cryogenic cooling in radiofrequency ion traps and the application of two-color, infrared–infrared (IR–IR) double-resonance spectroscopy have established a clear picture of how local hydrogen-bond topology drives the diverse spectral signatures of the excess proton. This information now enables a new generation of cluster studies designed to unravel the microscopic mechanics underlying the ultrafast relaxation dynamics displayed by H+(aq). Expected final online publication date for the Annual Review of Physical Chemistry, Volume 72 is April 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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