Filters








1,139 Hits in 2.9 sec

Helices and Sheets in vacuo

Martin F. Jarrold
2007 Physical Chemistry, Chemical Physics - PCCP  
The deflector provides an electric field F and a field gradient (qF/ qz) perpendicular to the beam axis.  ... 
doi:10.1039/b612615d pmid:17396176 fatcat:sb4ct7ybbzfefkmacazdsg4kuq

Focus on Ion Mobility Spectrometry, Honoring Gert von Helden, Martin F. Jarrold, and David E. Clemmer, Recipients of the 2018 John B. Fenn Award for a Distinguished Contribution in Mass Spectrometry

Michael T. Bowers, David H. Russell, Veronica M. Bierbaum
2019 Journal of the American Society for Mass Spectrometry  
I rushed off an affirmative answer to the young man making the inquiry, Martin Jarrold.  ...  Back to crossing paths with Martin Jarrold. Martin had left Bell Labs for a faculty job at Northwestern, arriving there in Fall 1992.  ... 
doi:10.1007/s13361-019-02195-6 pmid:30977044 fatcat:3xx63g2gsrhdffggk47xdb7kmy

Single-molecule mass spectrometry

David Z. Keifer, Martin F. Jarrold
2016 Mass spectrometry reviews (Print)  
The noise is larger at lower frequency because of the 1/f contribution. This increase can be mitigated by raising the ion energy in the trap.  ...  Recent work by Jarrold and co-workers has reduced the uncertainty in the charge measurement and lowered the limit of detection in CDMS Pierson et al., 2013 Pierson et al., , 2015 Keifer, Shinholt, & Jarrold  ... 
doi:10.1002/mas.21495 pmid:26873676 fatcat:at77iqnqwrgnvp472f7rh3h5ia

Solid Clusters above the Bulk Melting Point

Alexandre A. Shvartsburg, Martin F. Jarrold
2000 Physical Review Letters  
The fact that the melting points of nanoparticles are always lower than those of the corresponding bulk material is a paradigm supported by extensive experimental data for a large number of systems and by numerous calculations. Here we demonstrate that tin cluster ions with 10 -30 atoms remain solid at ϳ50 K above the melting point of bulk tin. This behavior is possibly related to the fact that the structure of the clusters is completely different from that of the bulk element.
doi:10.1103/physrevlett.85.2530 pmid:10978099 fatcat:i56cosvl7bddpdjnls7klo7rwe

Charge detection mass spectrometry: weighing heavier things

David Z. Keifer, Elizabeth E. Pierson, Martin F. Jarrold
2017 The Analyst  
Therefore, the 1/f noise is higher.  ...  Fig. 3 3 Schematic diagram of the modified cone trap of Contino and Jarrold. 65 Equipotential lines are shown in red.  ... 
doi:10.1039/c7an00277g pmid:28443838 fatcat:3hmhajby25d4xhqeo3hnzzexra

PEPTIDES AND PROTEINS IN THE VAPOR PHASE

Martin F. Jarrold
2000 Annual review of physical chemistry (Print)  
This article provides a review of recent studies of the properties of unsolvated (and partially solvated) peptides and proteins. The methods used to produce vapor-phase peptide and protein ions are described along with some of the techniques used to study them, such as H/D exchange, blackbody infrared radiative dissociation, and ion mobility measurements. Studies of unsolvated peptides and proteins provide information about their intrinsic intramolecular interactions. The topics covered include
more » ... the role of zwitterions and salt bridges in the vapor phase, Coulomb interactions in multiply charged ions, the unfolding and refolding of vapor-phase proteins, and the stability of unsolvated helices and sheets. Finally, dehydration and rehydration studies of proteins in the vapor phase are described. These can provide exquisitely detailed information about hydration interactions, such as the enthalpy and entropy changes associated with adsorbing individual water molecules.
doi:10.1146/annurev.physchem.51.1.179 pmid:11031280 fatcat:veiust342rclhism67lz46djce

Melting and Freezing of Metal Clusters

Andrés Aguado, Martin F. Jarrold
2011 Annual review of physical chemistry (Print)  
F.  ...  Margulis, Mark Maroncelli, and James F.  ... 
doi:10.1146/annurev-physchem-032210-103454 pmid:21128764 fatcat:v6vm5ufxtzemxpyajr6ane6gqq

Structures and Isomerization of LaCn+ Clusters

Konstantin B. Shelimov, David E. Clemmer, Martin F. Jarrold
1995 The Journal of Physical Chemistry  
Figure 6c -f compares isomer distributions for LaC25+ and LaC26+ at injection energies of 50 and 125-140 eV.  ...  The distributions were recorded at injection energies of (a) 50, (b) 150, (c) 50, (d) 125, (e) 40, and (f) 140 eV.  ... 
doi:10.1021/j100029a013 fatcat:6ulpjo3lpbalbckwaeyzz44qbi

Phase coexistence in melting aluminum clusters

Baopeng Cao, Anne K. Starace, Oscar H. Judd, Martin F. Jarrold
2009 Journal of Chemical Physics  
− ⌬H M ͒e −͑E−⌬H M ͒/k B T , ͑4͒ where f S ͑T͒ and f L ͑T͒ are the fraction of solidlike and liquidlike clusters, respectively.  ...  The contribution of the latent heats to the heat capacity is then C͑T͒ = dE int dT = ⌬͑− f S ͑T͒⌬H M ͒ ⌬T , ͑2͒ where f S ͑T͒ is the fraction of solidlike clusters present at temperature T.  ... 
doi:10.1063/1.3129525 pmid:19485445 fatcat:gzcijad2mnaczoszlgrpt6laoi

Structures and Formation of Small LaCn+ Metallofullerenes

Konstantin B. Shelimov, David E. Clemmer, Martin F. Jarrold
1994 The Journal of Physical Chemistry  
For C36+ the main annealing product is the monocyclic ring (isomer IV in Figure Id ), and only a small fraction of c 3 6 + rings converts into the f~llerene.~ At higher injection energies the rings  ... 
doi:10.1021/j100100a002 fatcat:mf4dqlakdrcylclvtuuno3tndm

Ion Mobility Measurements and their Applications to Clusters and Biomolecules

David E. Clemmer, Martin F. Jarrold
1997 Journal of Mass Spectrometry  
injected into the drift tube, the Ñux of ions leaving the drift tube as a function of time can be calculated from the transport equation. 63 For a single isomer the drift time distribution is given by F(  ...  More recently, Jarrold and co-workers16,17 coupled a pulsed laser vaporization source to an injected ion drift tube apparatus and used it to study the chemistry of mass-selected cluster ions, focusing  ... 
doi:10.1002/(sici)1096-9888(199706)32:6<577::aid-jms530>3.3.co;2-w fatcat:4u6dzd3i5vggdjgw6elcrlj2ge

Transition from covalent to metallic behavior in group-14 clusters

Alexandre A. Shvartsburg, Martin F. Jarrold
2000 Chemical Physics Letters  
Si and Ge clusters form prolate structures up to n f 25-35, but then rearrange to w x more spherical morphologies 11,12 .  ...  As described above, the mobilities of Ge and Sn cations in the n f 10-35 range follow n n the global trend of prolate Si q , although some sizen specific features for n 0 15 are not identical.  ... 
doi:10.1016/s0009-2614(99)01416-5 fatcat:rcpc5rwzzna7vftobettoslhjy

Tin clusters adopt prolate geometries

Alexandre A. Shvartsburg, Martin F. Jarrold
1999 Physical Review A. Atomic, Molecular, and Optical Physics  
We have characterized the structures of Sn n cations up to nϭ68 using ion mobility measurements. Up to nϳ35, tin clusters track the prolate growth pattern previously found for Si n and Ge n . However, the detailed size-dependent variations start deviating from those observed for Si n above nϭ14 and Ge n above nϭ21. Over the nϳ35-65 size range, tin clusters gradually rearrange towards near-spherical geometries, passing through several intermediate structural families. Two or three isomers are
more » ... olved for some sizes in the nϭ18-49 range. The observed geometries are independent of the He buffer gas temperature between 78 and 378 K and are not affected by collisional annealing.
doi:10.1103/physreva.60.1235 fatcat:sdcqfe5nf5bh5cm63c6gb4h5b4

Melting transitions in aluminum clusters: The role of partially melted intermediates

Colleen M. Neal, Anne K. Starace, Martin F. Jarrold
2007 Physical Review B  
Thus, rewriting Eq. ͑5͒, we have C = ͑1 − f L ͒S S ⌬E MD ͑T͒ ⌬T + f L S S S L ⌬E MD ͑T͒ ⌬T + ⌬͑f L ⌬H m ͒ ⌬T . ͑8͒ f L in this equation is a function of T m and ⌬H m .  ...  by C = ͑1 − f L ͒C S + f L C L + d͑f L ⌬H m ͒ dT , ͑5͒ where C S and C L are the heat capacities of the solid and liquid clusters, respectively, and the third term results from the latent heat.  ... 
doi:10.1103/physrevb.76.054113 fatcat:kh5t4oylivecljrgifgvxwymze

Core Protein-Directed Antivirals and Importinβ Can Synergistically Disrupt HBV Capsids [article]

Christine Kim, Lauren F Barnes, Christopher J Schlicksup, Angela Jean Patterson, Brian Bothner, Martin F Jarrold, Che-Yen Joseph Wang, Adam Zlotnick
2021 bioRxiv   pre-print
Although Impb-binding (black trucks) provides some stability to capsids, this interaction applies further mechanical strain on the capsid (C), which can be energetically compensated by rupturing (F).  ... 
doi:10.1101/2021.08.16.456586 fatcat:tewval6b6nbotbyghzqfuogjua
« Previous Showing results 1 — 15 out of 1,139 results