仪表
核磁共振光谱仪(NMR)
核磁共振是确定分子结构的关键仪器.
美国国家科学基金会(NSF), alumni, 还有大学, in 2001, 该部门获得了400兆赫的傅里叶变换核磁共振. 我们的JEOL Eclipse+光谱仪配备了多核, broadband probe allowing us to measure spectra from nuclei from 15N through 31P along with 19F and 1H. The superconducting magnet is actively shielded and is equipped with an 8 place autosampler as well as an autotune unit. The probe contains gradient shimming coils that improve the speed at which various measurements can be performed.
This type of instrument is available to graduate students at major research universities. 在bet365中文, 核磁共振用于一般化学, 有机化学, 仪器分析, 生物化学实验室, 是本科生科研工作的重要组成部分.
核磁共振的工作原理是将样品置于约200的磁场中,000 times stronger than the earth’s magnetic field and using radio frequency pulses, 在MHz范围内, 翻转分子中磁性原子核的自旋状态. 分裂模式, 强度, and chemical shift information can be interpreted to define the structure of molecules.
紫外-可见-近红外吸收光谱仪
The UV-Vis-NIR (ultraviolet-visible-near infrared) spectrometer is an important instrument that helps students characterize new molecules that are prepared and to determine the amount of compound in a solution. 简单地说，这个仪器帮助我们测量样品的颜色.
在美国国家科学基金会的另一项资助下. Murray was able to acquire a research grade Varian Cary-5000 scanning spectrometer that covers the spectral range 185nm - 3300nm. We use this instrument in various upper division and lower division courses as well as in research.
We also use modern Ocean Optics absorption spectrometers using fiber optic technology in some of our teaching labs.
The Absorption spectrometer works by monitoring the amount of light absorbed at various wavelengths. Samples absorb light at specific energies (wavelengths) due to electrons moving between orbitals in molecules. 轨道之间的能量差使化合物呈现出不同的颜色.
傅立叶变换红外光谱仪
The FTIR is an important instrument that helps scientists understand the parts of a molecule that are present.
Our newly updated Nicolet iS 50 FT-IR spectrometer is capable of resolutions as low as 0.5 cm-1. The Fourier Transform method relies on computational power and allows multiple spectra to be obtained very quickly. 红外光谱是有机化学实验室的重要研究工具.
Specific parts of molecules have characteristic energies at which they absorb infrared light. 在这些特征能量下，某些分子振动被激发. 例如，C- h、O- h或C=O键的拉伸或H-C-C基团的弯曲.
荧光光谱仪
In 2011, 有大学的慷慨支持, 该部门获得了一台新的瓦里安Cary Eclipse荧光光谱仪. The excitation wavelength and emission are individually scanable from 200-950nm. We were able to include a plate reader that will facilitate analyzing multiple samples in parallel. This unit will be used in Instrumental Analysis (and possibly Physical Chemistry II) as well as research by Dr. Murray博士. Hayes.
Fluorescence is the process that we observe in substances that glow under “black” or Ultraviolet (UV) light. 在荧光过程中, photons of light are absorbed by a sample and then re-emitted at a longer (lower energy) wavelength. The fluorescence spectrometer will allow us to understand the wavelengths at which molecules absorb light and also the wavelengths at which they are re-emitted.
高效液相色谱法
In 2011, the university supported the purchase of an Agilent 高效液相色谱法 system with a refractive index detector and a photo-diode array detector. 我们很高兴在我们的课程中开始使用这种乐器.
拉曼光谱仪
Raman spectroscopy is a complementary tool to IR and is finding increasing use in both qualitative and quantitative sample characterization. 拉曼像红外一样，通过确定分子振动时的能量来工作. The department has a Raman Systems RSI-2001 integrated desktop Raman spectrometer. The compact fiber-optic excitation and detection sample head is ideal for safe student use. 我们有探测器可以收集固体和液体样品的拉曼光谱. 另外, an immersion probe allows us to measure the spectrum of a sample directly in solution – useful for monitoring reactions. We have used Raman spectroscopy in General Chemistry and Physical Chemistry II labs.
激光与先进光学
The department has a Continuum Mini-Lite Nd:YAG (neodymium-doped yttrium aluminum garnet) laser that is used in General Chemistry and upper division labs. 翻倍, 三倍, and quadrupling crystals are available to achieve high power pulses of light at wavelengths from the infrared to ultraviolet regions of the spectrum. 我们还有一个带CCD相机的单色计，可以收集拉曼光谱.
电化学
We have a computer-controlled Cypress potentiostat to measure the current-voltage response of chemical systems. This can be used to characterize the voltages where compounds lose or gain an electron. 它还可以量化存在的物质的数量. 我们在仪器分析实验室中使用了该系统.
飞行时间气相色谱质谱计
TOF-GC/MS: Advanced students have access to a gas chromatography - time of flight mass spectrometer housed on campus. 气相色谱法能够分离复杂混合物的成分, while mass spectrometery is able to identify the molecular components in the mixture. Time of flight mass analyzers make use of the fact that heavier molecules fly more slowly than lighter molecules that are imparted with a constant amount of energy.
单四联gc /MS: 2012年夏季, the department with university support purchased an Agilent GC-MS for more undergraduate access. The mass analyzer is a Single Quadrupole and the system has an isolated GC column.
电感耦合等离子体发射光谱学
In 2013 we added the Perkin-Elmer Optima 8000 ICP-OES Spectrometer to our instrumentation stock. The ICP-OES uses inductively coupled plasma to produce excited atoms and ions allowing students in our analytical chemistry labs to identify trace elements from the emission of electromagnetic radiation at characteristic wavelengths.
