High-Resolution IR Spectroscopy of Dimers of HDO with H2O in Helium Nanodroplets

2011 ◽  
Vol 115 (23) ◽  
pp. 6297-6305 ◽  
Author(s):  
Anna Gutberlet ◽  
Gerhard Schwaab ◽  
Martina Havenith
Keyword(s):  
High Resolution ◽  
Ir Spectroscopy ◽  
Helium Nanodroplets

High resolution IR spectroscopy of HDO and HDO(N2)n in helium nanodroplets

2010 ◽  
Vol 133 (15) ◽  
pp. 154313 ◽  
Author(s):  
Anna Gutberlet ◽  
Gerhard Schwaab ◽  
Martina Havenith
Keyword(s):  
High Resolution ◽  
Ir Spectroscopy ◽  
Helium Nanodroplets

High resolution IR spectroscopy of acetylene-furan in ultracold helium nanodroplets

2008 ◽  
Vol 129 (11) ◽  
pp. 114307 ◽  
Author(s):  
Anja Metzelthin ◽  
Özgür Birer ◽  
Elsa Sánchez-García ◽  
Martina Havenith
Keyword(s):  
High Resolution ◽  
Ir Spectroscopy ◽  
Helium Nanodroplets

A close competition between O–H⋯O and O–H⋯π hydrogen bonding: IR spectroscopy of anisole–methanol complex in helium nanodroplets

2020 ◽  
Vol 22 (39) ◽  
pp. 22408-22416
Author(s):  
Tarun Kumar Roy ◽  
Devendra Mani ◽  
Gerhard Schwaab ◽  
Martina Havenith
Keyword(s):  
Hydrogen Bonding ◽  
Ir Spectroscopy ◽  
Helium Nanodroplets

Anisole forms O–H⋯O as well O–H⋯π bound complexes with methanol.

scholarly journals Infrared spectroscopic variability of Cygnus X-3

1999 ◽  
Vol 193 ◽  
pp. 358-359
Author(s):  
Margaret M. Hanson ◽  
Rob P. Fender ◽  
G.G. Pooley
Keyword(s):  
Mass Transfer ◽  
High Resolution ◽  
Ir Spectroscopy ◽  
Spherically Symmetric ◽  
X Rays ◽  
Spectral Variability ◽  
X Ray ◽  
Orbital Phase ◽  
Band Spectra ◽  
Binary Orbit

We present four epochs of high-resolution IR spectroscopy of the peculiar X-ray binary Cygnus X-3. The observations cover quiescent, small flaring and outburst states of the system as defined by radio and X-ray monitoring. The underlying IR spectrum of the source, as observed during radio and X-ray quiescence and small flaring states is one of broad, weak He II and N V emission. Spectral variability in this state is dominated by modulation at the 4.8 hr orbital period of the system. H-band spectra confirm the significant hydrogen depletion of the mass donor. In outburst, the infrared spectrum is dramatically different, with the appearance of very strong twin-peaked He I emission displaying both day-to-day variability and V (iolet) / R(ed) variations with orbital phase. We argue that the most likely explanation appears to be an enhanced stellar wind from the companion. Thus the X-ray and radio outbursts in this system are likely to originate in mass-transfer, and not disc instabilities. We suggest that the wind in Cyg X-3 is significantly flattened in the plane of the binary orbit. This may explain the observed twin-peaked He I features as well as reconcile the large infrared luminosity with the large optical depth to X-rays if Cyg X-3 is embedded in a spherically symmetric wind.

scholarly journals Acid solvation versus dissociation at “stardust conditions”: Reaction sequence matters

2019 ◽  
Vol 5 (6) ◽  
pp. eaav8179 ◽  
Author(s):  
Devendra Mani ◽  
Ricardo Pérez de Tudela ◽  
Raffael Schwan ◽  
Nitish Pal ◽  
Saskia Körning ◽  
...  
Keyword(s):  
Molecular Evolution ◽  
Ir Spectroscopy ◽  
Theoretical Study ◽  
Water Clusters ◽  
Acid Dissociation ◽  
Reaction Sequence ◽  
Helium Nanodroplets ◽  
Interstellar Clouds ◽  
Ab Initio Simulations ◽  
Reaction Stoichiometry

Chemical reactions at ultralow temperatures are of fundamental importance to primordial molecular evolution as it occurs on icy mantles of dust nanoparticles or on ultracold water clusters in dense interstellar clouds. As we show, studying reactions in a stepwise manner in ultracold helium nanodroplets by mass-selective infrared (IR) spectroscopy provides an avenue to mimic these “stardust conditions” in the laboratory. In our joint experimental/theoretical study, in which we successively add H2O molecules to HCl, we disclose a unique IR fingerprint at 1337 cm−1 that heralds hydronium (H3O+) formation and, thus, acid dissociation generating solvated protons. In stark contrast, no reaction is observed when reversing the sequence by allowing HCl to interact with preformed small embryonic ice-like clusters. Our ab initio simulations demonstrate that not only reaction stoichiometry but also the reaction sequence needs to be explicitly considered to rationalize ultracold chemistry.

Measurements of 18O-Enriched Ozone Isotopomer Abundances Using High-Resolution Fourier Transform Far-IR Spectroscopy

2000 ◽  
Vol 200 (2) ◽  
pp. 235-247 ◽  
Author(s):  
R. Wugt Larsen ◽  
N.W. Larsen ◽  
F.M. Nicolaisen ◽  
G.O. Sørensen ◽  
J.A. Beukes
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Ir Spectroscopy

Synthesis and characterization of several series of 4-acyl-1-[2-aryl-1-diazenyl]piperazines

2014 ◽  
Vol 92 (9) ◽  
pp. 838-848 ◽  
Author(s):  
Vanessa Renee Little ◽  
Keith Vaughan
Keyword(s):  
High Resolution ◽  
Ir Spectroscopy ◽  
Chemical Shifts ◽  
Synthesis And Characterization ◽  
Model Compounds ◽  
Primary Aromatic Amine ◽  
Piperazine Ring ◽  
H Nmr ◽  
C Nmr

Five series of a novel class of 4-acyl-1-[2-aryl-1-diazenyl]piperazines have been synthesized and characterized: the 4-acetyl-1-[2-aryl-1-diazenyl]piperazines [series 1]; the 4-cyclohexylcarbonyl-1-[2-aryl-1-diazenyl]piperazines [series 2]; the 4-benzoyl-1-[2-aryl-1-diazenyl]piperazines [series 3]; the benzyl 4-[2-aryl-1-diazenyl]-1-piperazinecarboxylates [series 4]; and the t-butyl 4-[2-aryl-1-diazenyl]-1-piperazinecarboxylates [series 5]. The compounds were synthesized by diazotization of a primary aromatic amine and subsequent coupling to an appropriate secondary amine: 1-acetylpiperazine [series 1]; 1-(cyclohexylcarbonyl)-piperaizine [series 2]; 1-benzoylpiperazine [series 3]; benzyl 1-piperazinecarboxylate [series 4]; and t-butyl piperazine-1-carboxylate (1-BOC-piperazine) [series 5]. The compounds of series 1–5 were characterized by 1H NMR, 13C NMR, high-resolution MS and IR spectroscopy. The model compounds 1,4-di[2-aryl-1-diazenyl]piperazines, and ethyl 4-[2-aryl-1-diazenyl]-1-piperazinecarboxylates were used to facilitate the assignment of the chemical shifts specific to the piperazine ring carbons. HSQC spectra of select compounds established the correlation between proton and carbon resonance signals.

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