Ultra low frequency raman with the LabRAM HR

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HORIBAScientific Page 2/4 Pharmaceutical polymorphs ·LLA modes of polymer Semiconductor lattices and superlattices Material phase/structure Metal Halides Gases Carbon nanotubes Micro-crystallites Protein Raman Shift (cm") ULF Raman measurements of L-Cystine at 532， 633， and 785 nmwavelengths. Stokes and Anti-Stokes bands at 9 cm’are clearly resolvedat all wavelengths. Access to Raman frequencies down to 5 cmwith a singlestage monochromator. Preserves high throughput advantage of single stagespectrographs (favouring sensitivity， mapping speed...)：transmission >70% at 633 nm. Allows measuring the entire Raman/PL range (from 400to 2500 nm). Available wavelengths： 488， 514.5，532，633 and785 nm. HORIBA Scienenttiiffiicc hhaass implemented VBG filters in the_abRAM HR allowing key measurements of importantmaterials to be made，including analysis of lattice modes inpharmaceutical polymorphs， longitudinal acoustic modesLAM) in polymers or superlattice modes of semiconductors.-or the first time， these measurements are available inroutine analytical instruments， without the need to move tolarger， more complex instrumentation. Notch filters curve at 633 nm. Transition to 50%transmission is shown here. Raman Shift (cm) Semiconductor superlattices are composed of alternatelayers of two different semiconductors.Superlattices have alot of applications in electronic (diode，...) and in optic (laser，detector，...). One of remarkable effects is the folding of acoustic branchesrelated to the periodicity of the superlattices. These foldedacoustic phonon modes are observed in the low-frequencyregion of Raman spectrum and give information about thestructural quality of the superlattices. Semiconductor superlattices. Data courtesy of P. H. Tan， State Key Laboratory for SL and Microstr.， Instituteof Semiconductors， Beijing， 100083，P. R. China and K. Brunner， UniversityWuerzburg， EP 3， Am Hubland， D-97074 Wuerzburg， Germany. Raman Shift (cm") Longitudinal acoustic modes in bulk PE crystals. Raman Shift (cm) Raman Shift (cm") ULF at 514 nm： Borate glass spectrum. Structural properties of borate glasses can be studied by following the low-energy vibrational modes (Boson Peak) in the 20- 100 cmrange. Data courtesy of Barbara Fazio， CNR- Istituto Processi Chimico-Fisici Messina (ltalia) L-Phenylalanine spectrum at 514 nm.L-Phenylalanine is a natural form of phenylalanine， who is an essential aminoacid， found in most foods that contain protein and also in aspartame. It is alsoa constituant of some antidepressant and diet drugs. Data courtesy of Pietro G. Gucciardi， CNR - Istituto Processi Chimico-Fisici Messina (Italia) Raman Shift (cm-) The ULF module allows Raman spectroscopic informationin the sub-100 cm1region，with measurements down to5 cmroutinely available. It retains the high throughput ofthe single spectrometer， and measurements are obtainedin just a few seconds or minutes without any limitation inthe higher wavenumber region. Stokes and Anti-Stokesspectral features can be simultaneously measured， providingadditional information to the user. Traditionally， low frequency analysis has been confinedto large research systems or complex and expensiveinstruments such as far IR， terahertz spectrometers or triplemonochromator. Thus， the module opens up new areas ofresearch for routine Raman microscopy. ULF provides important information on a range of sampletypes， from pharmaceutical polymorphs or carbon nanotubesto heavy metal halides and semiconductors. The ULF modecan give details on conformational changes， subtle changesin lattice structure and even gaseous phase bond length，parameters not easily accessible oon nt：raditional benchtopequipment. NH2 OH Raman Shift (cm") Pharmaceutical polymorph (carbamazepine) spectrum at 633 nm. Carbamazepine is an anticonvulsant and mood stabilizing drug used primarilyin the treatment of epilepsy and bipolar disorder. Raman Shift (cm") Raman Shift (cm) ULFspectrum at 514 nm： HgCl. ULF spectrum at 514 nm： TIH，PO， Data courtesy of Dr. Bellot-Gurlet， Laboratoire de Dynamique， Interactionset Reactivite， Universite Pierre & Marie Curie， Paris (France) Data courtesy of Dr.Bellot-Gurlet，Laboratoire de Dynamique， Interactionset Reactivite， Universite Pierre & Marie Curie， Paris (France) References Web links ( A. Rapaport， B. Roussel， H . -J. Reich， F . A dar， A . G lebov，O.Mokhun， V.Smirnov，and L. G l ebov，"Very Low FrequencyStokes and Anti-Stokes Raman Spectra Accessible witha Single Multichannel Spectrograph and Volume BraggGrating Optical Filters，" ICORS 2010， AIP C onf. Proc. 1267，808-809 (2010). ) http：//www.raman-scattering.eu/raman/texts/046_text_36.php http：//www.horiba.com/scientific/products/raman-：cAs：spectroscopy/accessories/ultra-low-frequency-raman-module/ http：//www.laboratoryequipment.com/product-ss-horiba-scientific-ulf-labram-raman-system-030111.aspx J. Ibanez， A. Rapaport， C. Boney，R. Oliva， R. Cusco，A. Bensaoula， and L. Artus， "Raman scattering by foldedacoustic phonons in InGaN/GaN superlattices，" Journal ofRaman Spectroscopy (published online July 14th 2011). JOBIN YVONTechnologyHORIBAExplore the futureAutomotive Test Systems Process & Environmental MedicallSemiconductorIl Scientific