نتایج جستجو برای: infrared ir spectra

تعداد نتایج: 256750  

1999
James R. Heath A. P. Alivisatos

Three different size distributions of Ge quantum dots (>200, 110, and 60 A) have been synthesized via the ultrasonic mediated reduction of mixtures of chlorogermanes and organochlorogermanes (or organochlorosilanes) by a colloidal sodium/potassium alloy in heptane, followed by annealing in a sealed pressure vessel at 270 “C. The quantum dots are characterized by transmission electron microscopy...

Journal: :Physical chemistry chemical physics : PCCP 2017
Ahreum Min Ahreum Ahn Cheol Joo Moon Ji Hoon Lee Yeon Guk Seong Seong Keun Kim Myong Yong Choi

Jet-cooled acetaminophen (AAP)-water clusters, AAP-(H2O)1, were investigated by mass-selected resonant two-photon ionization (R2PI), ultraviolet-ultraviolet hole-burning (UV-UV HB), infrared-dip (IR-dip), and infrared-ultraviolet hole-burning (IR-UV HB) spectroscopy. Each syn- and anti-AAP rotamer has three distinctive binding sites (-OH, >CO, and >NH) for a water molecule, thus 6 different AAP...

2017
K. Rajalakshmi

The Fourier transform infrared spectra (FT-IR) and Fourier transform Raman spectra (FT Raman) of The 1-Propyl 4-Piperidone have been recorded in the regions 4000-400, 4000-100 cm -1 . The ultraviolet spectra (UV) spectra of the title molecule in the region 800-200 cm -1 . Utilizing the observed FT-IR and FT Raman spectra data, a complete vibrational assignments and analysis of the fundamental m...

2002
Nicholas L. Pivonka Cristina Kaposta Gert von Helden Gerard Meijer Ludger Wöste Daniel M. Neumark Knut R. Asmis

The gas phase vibrational spectroscopy of Br•~HBr!1,2,3 clusters has been studied between 6 and 16 mm ~625 and 1700 cm! by multiphoton infrared photodissociation spectroscopy using the output of the free electron laser for infrared experiments. Infrared ~IR! spectra were recorded by monitoring the mass-selected ion yield. In all three systems neutral HBr loss is found to be the dominant photofr...

Journal: :Applied spectroscopy 2010
S H Gordon A Mohamed R E Harry-O'kuru S H Imam

Mid-infrared (mid-IR) analysis of solid biomaterials by the familiar KBr disc technique is all too often frustrated by water interference in the very important protein (amide) and carbohydrate (hydroxyl) regions of their spectra. A method was therefore devised that overcomes the difficulty and corrects IR spectra of solid biomaterials in KBr discs by mathematically eliminating the interference ...

2007
E. Valiante D. Lutz E. Sturm R. Genzel L. J. Tacconi M. D. Lehnert A. J. Baker

We present rest frame mid-infrared spectroscopy of a sample of 13 submillime-ter galaxies, obtained using the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope. The sample includes exclusively bright objects from blank fields and cluster lens assisted surveys that have accurate interferometric positions. We find that the majority of spectra are well fitted by a starburst template...

2013
Ryoichi Ishii Hiromu Mori Kenji Matsumura Norio Hongo Hiro Kiyosue Shunro Matsumoto Takeshi Yoshimi Seiji Ujiie

Purpose: The purpose of this study is to assess molecular interactions between several anticancer drugs and an iodinated contrast medium by Fourier transform infrared spectroscopy (FT-IR) and ultravioletvisible spectroscopy (UV-Vis). Materials and Methods: Iopamidol (IPM) was used as an iodinated contrast medium, and mitomycin C (MMC), epirubicin hydrochloride (EPI), cisplatin (CDDP), 5-fluorou...

2017
Moe Matsuoka Tomoki Nakamura Takahito Osawa Takahiro Iwata Kohei Kitazato Masanao Abe Yusuke Nakauchi Takehiko Arai Mutsumi Komatsu Takahiro Hiroi Naoya Imae Akira Yamaguchi Hideyasu Kojima

We conducted ground-based performance evaluation tests of the Near-Infrared Spectrometer (NIRS3) onboard Hayabusa2 spacecraft in November 2013 and from April to May 2014 and established a method for evaluating its measured reflectance spectra. Reflectance spectra of nine powdered carbonaceous chondrite samples were measured by both NIRS3 and a Fourier transform infrared (FT-IR) spectrometer. We...

2006
C. Boersma J. Bouwman

Context. Infrared (IR) spectra provide a prime tool to study the characteristics of polycyclic aromatic hydrocarbon (PAH) molecules in regions of star formation. Herbig Ae/Be stars are a class of young pre-main sequence stellar objects of intermediate mass. They are known to have varying amounts of natal cloud material still present in their direct vicinity. Aims. We characterise the IR emissio...

2013
Maria Eugenia Castro Maria Judith Percino Victor M. Chapela Margarita Ceron Guillermo Soriano-Moro Jorge Lopez-Cruz Francisco J. Melendez

A combined theoretical and experimental study on the structure, infrared, UV-Vis and 1H NMR data of trans-2-(m-cyanostyryl)pyridine, trans-2-[3-methyl-(m-cyanostyryl)]pyridine and trans-4-(m-cyanostyryl)pyridine is presented. The synthesis was carried out with an efficient Knoevenagel condensation using green chemistry conditions. Theoretical geometry optimizations and their IR spectra were ca...

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