An interpretation of molecular fragmentation dynamics in terms of the resonance spectrum

1990 ◽  
Vol 93 (7) ◽  
pp. 4750-4760 ◽  
Author(s):  
G. Jolicard ◽  
O. Atabek
Keyword(s):  
Resonance Spectrum ◽  
Molecular Fragmentation ◽  
Fragmentation Dynamics

scholarly journals Multiple ionization and fragmentation dynamics of molecular iodine studied in IR–XUV pump–probe experiments

2014 ◽  
Vol 171 ◽  
pp. 41-56 ◽  
Author(s):  
K. Schnorr ◽  
A. Senftleben ◽  
G. Schmid ◽  
A. Rudenko ◽  
M. Kurka ◽  
...  
Keyword(s):  
Free Electron Laser ◽  
Molecular Iodine ◽  
Photon Absorption ◽  
Molecular Fragments ◽  
Pump Probe ◽  
Molecular Fragmentation ◽  
Light Pulses ◽  
Multiple Ionization ◽  
Fragmentation Dynamics ◽  
Optical Laser

The ionization and fragmentation dynamics of iodine molecules (I2) are traced using very intense (∼1014 W cm−2) ultra-short (∼60 fs) light pulses with 87 eV photons of the Free-electron LASer at Hamburg (FLASH) in combination with a synchronized femtosecond optical laser. Within a pump–probe scheme the IR pulse initiates a molecular fragmentation and then, after an adjustable time delay, the system is exposed to an intense FEL pulse. This way we follow the creation of highly-charged molecular fragments as a function of time, and probe the dynamics of multi-photon absorption during the transition from a molecule to individual atoms.

The laser magnetic resonance spectrum of the ν2 band of the methylene radical CH2

1982 ◽  
Vol 77 (11) ◽  
pp. 5363-5369 ◽  
Author(s):  
Trevor J. Sears ◽  
P. R. Bunker ◽  
A. R. W. McKellar
Keyword(s):  
Magnetic Resonance ◽  
Resonance Spectrum ◽  
Laser Magnetic Resonance

scholarly journals Optimization of Lignin Extraction Variables by Response Surface Methodology from Pine Saw Dust, and Quantification of Major Structural Units in Isolated Lignin Fraction

2021 ◽  
Vol 11 (4) ◽  
pp. 1739
Author(s):  
Muhammad Ajaz Ahmed ◽  
Jae Hoon Lee ◽  
Joon Weon Choi
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Quantum Coherence ◽  
Resonance Spectrum ◽  
Quadratic Model ◽  
Molecular Weights ◽  
Solids Loading ◽  
A Value ◽  
Lignin Extraction ◽  
Lignin Fraction

A synergistic combination of dioxane, acetic acid, and HCl was investigated for lignin extraction from pine wood biomass. After initial screening of reagent combination, response surface methodology (RSM) was used to optimize the lignin yield with respect to the variables of time 24–72 h, solids loading 5–15%, and catalyst dose 5–15 mL. A quadratic model predicted 8.33% of the lignin yield, and it was further confirmed experimentally and through the analysis of variance (ANOVA). Lignin at optimum combination exhibited features in terms of derivatization followed by reductive cleavage (DFRC) with a value of (305 µmol/gm), average molecular weights of 4358 and polydispersity of 1.65, and 2D heteronuclear single quantum coherence nuclear magnetic resonance spectrum (2D-HSQC NMR) analysis showing relative β-O-4 linkages (37.80%). From here it can be suggested that this fractionation can be one option for high quality lignin extraction from lignocellulosic biomass.

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