High-Resolution IR Spectroscopy in Low-Temperature Matrices. Structure of Fundamental Absorption Bands of SiH4 in Nitrogen and Argon Matrices

<div><div>Scattering-mode Scanning Near-Field Optical Microscopy (sSNOM) allows one to obtain absorption spectra in the mid-IR region for samples as small as 20 nm in size. This configuration has made it possible to measure FTIR spectra of the protein complement of membranes. (Amenabar 2013) We now show that mid-IR sSNOM has the sensitivity required to measure spectra of phospholipids in individual bilayers in the spectral range 800 cm<sup>-1</sup>–1400 cm<sup>-1</sup>. We have observed the main absorption bands of the dipalmitoylphosphatidylcholine headgroups in this spectral region above noise level. We have also mapped the phosphate absorption band at 1070 cm<sup>-1</sup> simultaneously with the AFM topography. We have shown that we could achieve sufficient contrast to discriminate between single and multiple phospholipid bilayers and other structures, such as liposomes. This work opens the way to further research that uses nano-IR spectroscopy to describe the biochemistry of cell membranes and model systems.</div></div><div></div>

Download Full-text

Low-temperature oxidation of a gasoline surrogate: Experimental investigation in JSR and RCM using high-resolution mass spectrometry

Combustion and Flame ◽

10.1016/j.combustflame.2021.01.037 ◽

2021 ◽

Vol 228 ◽

pp. 128-141

Author(s):

Nesrine Belhadj ◽

Roland Benoit ◽

Philippe Dagaut ◽

Maxence Lailliau ◽

Bruno Moreau ◽

...

Keyword(s):

Mass Spectrometry ◽

Experimental Investigation ◽

High Resolution ◽

Low Temperature ◽

High Resolution Mass Spectrometry ◽

Low Temperature Oxidation ◽

Temperature Oxidation ◽

High Resolution Mass ◽

Resolution Mass

Download Full-text

Transition Insulator-Metal and Antiferromagnetic-Paramagnetic Cu Doped in La0.47Ca0.53MnO3

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1123.73 ◽

2015 ◽

Vol 1123 ◽

pp. 73-77 ◽

Cited By ~ 1

Author(s):

Yohanes Edi Gunanto ◽

K. Sinaga ◽

B. Kurniawan ◽

S. Poertadji ◽

H. Tanaka ◽

...

Keyword(s):

High Resolution ◽

Low Temperature ◽

Magnetic Structure ◽

Room Temperature ◽

Paramagnetic Phase ◽

Perovskite Manganites ◽

Antiferromagnetic Phase ◽

Temperature Transition ◽

Cu Doping ◽

Metal State

The study of the perovskite manganites La0.47Ca0.53Mn1-xCuxO3 with x = 0, 0.06, 0.09, and 0.13 has been done. The magnetic structure was determined using high-resolution neutron scattering at room temperature and low temperature. All samples were paramagnetic at room temperature and antiferromagnetic at low temperature. Using the SQUID Quantum Design, the samples showed that the doping of the insulating antiferromagnetic phase La0.47Ca0.53MnO3 with Cu doping resulted in the temperature transition from an insulator to metal state, and an antiferromagnetic to paramagnetic phase. The temperature transition from an insulator to metal state ranged from 23 to 100 K and from 200 to 230 K for the transition from an antiferromagnetic to paramagnetic phase.

Download Full-text

Absorption Bands and Luminescence of LiF Irradiated at Low Temperature

Physical Review ◽

10.1103/physrev.78.293 ◽

1950 ◽

Vol 78 (3) ◽

pp. 293-293 ◽

Cited By ~ 23

Author(s):

Peter Pringsheim ◽

Philip Yuster

Keyword(s):

Low Temperature ◽

Absorption Bands

Download Full-text

Formation and Structure of Thin Mo Layers and Mo-Ni Multilayers on Ni(001) by Molecular Beam Epitaxy

MRS Proceedings ◽

10.1557/proc-160-215 ◽

1989 ◽

Vol 160 ◽

Author(s):

Y.H. Lee ◽

R.P. Burns ◽

J.B. Posthill ◽

K.J. Bachmann

Keyword(s):

Thin Films ◽

High Temperature ◽

High Resolution ◽

Molecular Beam Epitaxy ◽

Low Temperature ◽

Molecular Beam ◽

Nucleation And Growth ◽

Multilayer Heterostructures ◽

Annealing Experiments ◽

Small Period

AbstractThe growth of Mo overtayers and Mo-Ni multilayers on single crystal Ni(001) substrates is described. The nucleation and growth processes of these thin films were analyzed by LEED, XPS, AES and SEM and High Resolution AES investigations without breaking vacuum. Growth of Mo-Ni multilayer heterostructures on Ni(001) with ≈20Å periodicity is possible at low temperature (≈200 °C). At high temperature (≈550 °C) the growth proceeds by the Volmer-Weber mechanism preventing the deposition of small period multilayers. Annealing experiments on ultra-thin (<20Å) Mo overiayers deposited at 200 °C show an onset of interdiffusion at ≈ 550°C coupled to the generation of a new surface periodicity.

Download Full-text