[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-1-en-105":3,"doc-seo-573524-105":53,"doc-detail-573524-en":126},{"code":4,"msg":5,"data":6},0,"success",[7,14,19,24,29,34,39,44,49],{"id":8,"doc_module":9,"doc_module_name":10,"category_name":11,"show_sort_weight":12,"slug":13},11,1,"Template","Presentations",90,"presentations",{"id":15,"doc_module":9,"doc_module_name":10,"category_name":16,"show_sort_weight":17,"slug":18},12,"Resumes",80,"resumes",{"id":20,"doc_module":9,"doc_module_name":10,"category_name":21,"show_sort_weight":22,"slug":23},14,"Invoices",70,"invoices",{"id":25,"doc_module":9,"doc_module_name":10,"category_name":26,"show_sort_weight":27,"slug":28},15,"Posters",60,"posters",{"id":30,"doc_module":9,"doc_module_name":10,"category_name":31,"show_sort_weight":32,"slug":33},16,"Social Media",50,"social-media",{"id":35,"doc_module":9,"doc_module_name":10,"category_name":36,"show_sort_weight":37,"slug":38},17,"Forms",40,"forms",{"id":40,"doc_module":9,"doc_module_name":10,"category_name":41,"show_sort_weight":42,"slug":43},18,"Letters",30,"letters",{"id":45,"doc_module":9,"doc_module_name":10,"category_name":46,"show_sort_weight":47,"slug":48},21,"Paper Templates",5,"papers-templates",{"id":50,"doc_module":9,"doc_module_name":10,"category_name":51,"show_sort_weight":4,"slug":52},158,"General","general-158",{"code":4,"msg":54,"data":55},"ok",{"site_id":56,"language":57,"slug":58,"title":59,"keywords":60,"description":61,"schema_data":62,"social_meta":119,"head_meta":121,"extra_data":123,"updated_unix":125},105,"en","experiment-6-infrared-spectroscopy-experiment","Experiment-6 - Infrared Spectroscopy Experiment","","Infrared Spectroscopy Experiment-6 explains how infrared absorption spectra reveal molecular vibration information and supports structure analysis. It outlines the infrared region (0.8–200 µm) and compares three zones by wavenumber and wavelength, plus group frequency and fingerprint regions with representative bond examples such as C=O and C–H. It further derives vibration frequency using Hooke’s Law, showing how force constants and reduced mass affect wavenumber values, and describes how dipole moment changes govern absorption intensity.",{"@graph":63,"@context":118},[64,80,101],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":51,"@type":70,"position":76},"https://docshare.wps.com/template/general/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/experiment-6-infrared-spectroscopy-experiment/573524/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/experiment-6-infrared-spectroscopy-experiment/573524.png","ImageObject",442,249,{"name":88,"@type":89},"Sophia Brooks","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/pdf","2026-10-17","2026-10-14",true,{"@type":98,"interactionType":99,"userInteractionCount":79},"InteractionCounter",{"@type":100},"ViewAction",{"@type":102,"mainEntity":103},"FAQPage",[104,110,114],{"name":105,"@type":106,"acceptedAnswer":107},"What can infrared spectroscopy reveal about a compound?","Question",{"text":108,"@type":109},"Infrared spectra provide characteristic properties of a compound by relating absorption bands to changes in vibration energy associated with molecular structure.","Answer",{"name":111,"@type":106,"acceptedAnswer":112},"How are the infrared regions classified in the experiment?",{"text":113,"@type":109},"The infrared region is described using both wavenumber and wavelength and grouped into near IR (12500–4000 cm-1), ordinary IR (4000–667 cm-1), and far IR (667–50 cm-1), with additional discussion of group frequency and fingerprint regions.",{"name":115,"@type":106,"acceptedAnswer":116},"How is vibration frequency calculated using Hooke’s Law?",{"text":117,"@type":109},"Vibration frequency is derived from Hooke’s Law where frequency depends on bond force constant (K) and reduced mass (μ) of the bonded atoms, and the resulting wavenumber is obtained using c and the relationship to frequency.","https://schema.org",{"og:url":78,"og:type":120,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":122,"canonical":78},"index,follow",{"doc_id":124,"site_id":56},573524,1792040010,{"code":4,"msg":5,"data":127},{"doc_id":124,"user_id":128,"nickname":88,"user_avatar":129,"doc_module":9,"category_id":50,"category_name":51,"doc_title":59,"doc_description":61,"doc_content":130,"file_id":131,"file_url":132,"file_type":133,"file_size":134,"view_count":79,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":135,"language":136,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":137,"faqs":138,"seo_title":139,"seo_description":61,"update_tm":140,"read_time":76},962084925636,"https://ap-avatar.wpscdn.com/davatar_994ba38a5ba835b3df7d355c54d3ed8d","Experiment-6  \nInfrared Spectroscopy Experiment  \nOutcomes:-  \nAfter completing this experiment, the student should be able to:  \n􀂾 The basic principles of vibration spectroscopy.  \n􀂾 Determine the relationship between molecular structural features and absorptions in the IR spectrum.  \n􀂾 Mull technique and disc technique of solid pharmaceutical substance.  \n􀂾 Calibration of IR spectroscopy.  \nIntroduction:-  \nThe infrared spectrum provides the largest number of characteristic properties of a compound. It also serves as a powerful ‘analytical tool’ for the extensive and intensive study of molecular structure, in fact, infrared absorption spectra are due to changes in vibration energy accompanied by changes in rotation energy, broadly speaking, the range in the electromagnetic spectrum that extends from (0.8-200 µm) is referred to as the infrared region.  \nIn usual practice, however, either the wavelength (􀁏) or the wavenumber(ΰ=cm-1) is employed to measure the position of a given infrared absorption, more precisely, the infrared regions may be categorized into three distinct zones based on their respective wavenumber and wavelength as stated below:-  \n\n| S. No. | Region | Wavenumber(cm-1) | Wavelength(µm) |\n| --- | --- | --- | --- |\n| 1. | Near I.R. | 12500-4000 | 0.8-2.5 |\n| 2. | Ordinary I.R. | 4000-667 | 2.5-15 |\n| 3. | Far I.R. | 667-50 | 15-200 |\n\nBesides, the infrared region is found to be normally rich in peaks by virtue of the fact that there exist a number of vibration modes (3n-6 for any nonlinear molecule, 3n-5 for any linear molecule, where, n = number of atoms) .  \nAnother school of thought advocates that there are two general regions in the infrared spectrum, namely:-  \n(a) Group frequency region:-  \nHaving a wavelength ranging from (2.5-8µm) and a wavenumber from (4000- 1300cm–1) Here, the stretching and bending vibration bonds associated with specific structure or function groups are observed frequently.  \nExample : The C = O stretching vibration is about 1700 cm–1; whereas the C—H stretching vibration is about 3000 cm–1 and both of them are almost independent of  \nthe rest of the molecule as depicted:- Stretching vibration found in Group Frequency Region  \n\n| C—H Stretch |  |  | C = O Stretch |  |  |\n| --- | --- | --- | --- | --- | --- |\n| S. No. | Molecule | Wavenumber(cm–1) | S. No. | Molecule | Wavenumber(cm–1) |\n| 1 | CHCl3 | 3019 | 1 | CH3COCH3 | 1715 |\n| 2 | C2H2Cl2 | 3089 | 2 | CH3CHO | 1729 |\n| 3 | CH2 = CH2 | 3105—2990 | 3 | H5C2COC2H5 | 1720 |\n| 4 | C6H6 | 3099 | 4 | HCOOH | 1729 |\n| 5 | CH3OH | 2977 | 5 | CH3COOH | 1718 |\n| 6 | CH ≡CH | 3287 | 6 | CF3COOH | 1776 |\n\n(b) Fingerprint region:-  \nHaving a wavelength ranging from (8.0-25µm) and a wavenumber from 1300-400 cm–1 Here, the vibration modes depend solely and strongly on the rest of the molecule.  \nExample:-The C—C stretching vibration depends largely on what else is bonded to the carbon atoms, it is interesting to observe here that this particular region of the spectrum is densely populated with bands.  \nAs we know that no two ‘fingerprints’ could be identical in human beings, exactly in a similar manner no two compounds may have the same ‘fingerprint region’, thus, each and every molecule essentially gives rise to a unique spectrum which offers a characteristic feature of the same.  \nIR may actually be thought of as a Function Group detector, the quickest and easiest way to determine the presence of \"Function Groups\" is to take the IR spectrum of the compound; the technique is simple and can often provide a definitive answer in less than ten minutes, evidence provided by IR is widely respected, it is commonly used in judicial proceedings as much as fingerprints are used, in fact, the IR of a pure compound bears the same relationship to that compound as fingerprints do to an individual.  \nCalculation of Vibration Frequencies:-  \nThe vibration frequency may be calculated with fairly remarkable accuracy by the help of Hooke’s Law “The vibration fr","cbCaiu8PCcoaHo0t","https://ap.wps.com/l/cbCaiu8PCcoaHo0t","pdf",868739,7,"English","# Outcomes\n## Introduction\n## Infrared region classification\n### Near IR, Ordinary IR, Far IR\n## Group frequency region\n## Fingerprint region\n## Calculation of vibration frequencies\n## Infrared absorption and vibration energy","[{\"question\":\"What can infrared spectroscopy reveal about a compound?\",\"answer\":\"Infrared spectra provide characteristic properties of a compound by relating absorption bands to changes in vibration energy associated with molecular structure.\"},{\"question\":\"How are the infrared regions classified in the experiment?\",\"answer\":\"The infrared region is described using both wavenumber and wavelength and grouped into near IR (12500–4000 cm-1), ordinary IR (4000–667 cm-1), and far IR (667–50 cm-1), with additional discussion of group frequency and fingerprint regions.\"},{\"question\":\"How is vibration frequency calculated using Hooke’s Law?\",\"answer\":\"Vibration frequency is derived from Hooke’s Law where frequency depends on bond force constant (K) and reduced mass (μ) of the bonded atoms, and the resulting wavenumber is obtained using c and the relationship to frequency.\"}]","Experiment-6 - Infrared Spectroscopy Experiment | PDF",1791941984]