{"id":6768,"date":"2026-09-24T12:35:19","date_gmt":"2026-09-24T12:35:19","guid":{"rendered":"https:\/\/www.hcftir.com\/ftir-vs-raman\/"},"modified":"2026-09-25T11:31:59","modified_gmt":"2026-09-25T11:31:59","slug":"ftir-vs-raman","status":"publish","type":"page","link":"https:\/\/www.hcftir.com\/es\/ftir-vs-raman\/","title":{"rendered":"FTIR frente a Raman"},"content":{"rendered":"<div class=\"path_bar\"><div class=\"layout\" style=\"margin:0 auto\"><ul><li><a href=\"\/\">Inicio<\/a><\/li><li><a href=\"\">FTIR frente a Raman<\/a><\/li><\/ul><\/div><\/div>\n\n\n<h1 class=\"wp-block-heading has-text-align-center layout sh h20 ch\" style=\"font-size:30px\">FTIR frente a Raman<\/h1>\n\n\n<p class=\"has-text-align-center layout bt pa\">FTIR y Raman estudian las vibraciones moleculares, pero miden fen\u00f3menos f\u00edsicos distintos y por eso se adaptan a muestras diferentes. FTIR mide cu\u00e1nta luz infrarroja absorbe una muestra; Raman mide el peque\u00f1o desplazamiento de la luz l\u00e1ser dispersada. Conocer la fortaleza de cada t\u00e9cnica evita comprar el instrumento equivocado o preparar mal las muestras.<\/p>\n\n\n<div class=\"layout\" style=\"margin:0 auto 50px\">\n\n<h2>Qu\u00e9 mide cada t\u00e9cnica<\/h2>\n<p>En FTIR, la muestra absorbe radiaci\u00f3n infrarroja en frecuencias que coinciden con sus vibraciones moleculares; el espectro de absorci\u00f3n resultante es la conocida \u201chuella dactilar\u201d. En Raman, un l\u00e1ser monocrom\u00e1tico excita la muestra y una peque\u00f1a fracci\u00f3n de la luz dispersada cambia de frecuencia seg\u00fan los mismos modos vibracionales.<\/p>\n<p>La consecuencia pr\u00e1ctica es que ambas t\u00e9cnicas no ven lo mismo: las vibraciones que modifican el momento dipolar de una mol\u00e9cula son intensas en FTIR, mientras que las que modifican su polarizabilidad son intensas en Raman. Por eso muchos laboratorios utilizan las dos.<\/p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.hcftir.com\/wp-content\/uploads\/2026\/06\/How-to-Prepare-KBr-Pellets-for-FTIR-Analysis.webp\" alt=\"Preparaci\u00f3n de muestras FTIR para mediciones por transmisi\u00f3n\" \/><figcaption>El trabajo de transmisi\u00f3n FTIR depende de la preparaci\u00f3n de la muestra, algo que Raman evita en gran medida.<\/figcaption><\/figure>\n\n\n<h2>Agua, aire y manejo de muestras<\/h2>\n<table>\n<thead><tr><th>Factor<\/th><th>FTIR<\/th><th>Raman<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>Water<\/td><td>Absorci\u00f3n intensa; las muestras acuosas son dif\u00edciles y requieren celdas especiales o ATR<\/td><td>D\u00e9bil; las disoluciones acuosas se miden de forma rutinaria<\/td><\/tr>\n<tr><td>Aire (CO\u2082 y vapor de agua)<\/td><td>Interfiere; es habitual purgar o compensar la atm\u00f3sfera<\/td><td>Pr\u00e1cticamente no le afecta<\/td><\/tr>\n<tr><td>Vidrio y envases<\/td><td>El vidrio es opaco en el infrarrojo medio; medir a trav\u00e9s de envases es limitado<\/td><td>Permite medir a trav\u00e9s de vidrio y de muchos envases transparentes<\/td><\/tr>\n<tr><td>Preparaci\u00f3n de las muestras<\/td><td>A menudo necesaria (pastilla de KBr, mull, contacto ATR)<\/td><td>Poca o ninguna; s\u00f3lidos y l\u00edquidos pueden medirse directamente<\/td><\/tr>\n<tr><td>Fluorescencia<\/td><td>No es un problema<\/td><td>Puede enmascarar la se\u00f1al Raman en algunas muestras coloreadas u org\u00e1nicas<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n<h2>Cu\u00e1ndo FTIR es la mejor opci\u00f3n<\/h2>\n<ul>\n<li>Compuestos org\u00e1nicos, pol\u00edmeros y materiales farmac\u00e9uticos con fuerte absorci\u00f3n infrarroja<\/li>\n<li>Trabajo cuantitativo basado en m\u00e9todos FTIR establecidos y bibliotecas espectrales<\/li>\n<li>Laboratorios que ya trabajan con pastillas de KBr o ATR<\/li>\n<li>Aplicaciones que requieren espectros de referencia est\u00e1ndar y documentaci\u00f3n de cumplimiento<\/li>\n<\/ul>\n\n<h2>Cu\u00e1ndo Raman es la mejor opci\u00f3n<\/h2>\n<ul>\n<li>Materiales inorg\u00e1nicos, minerales y \u00f3xidos met\u00e1licos, a menudo d\u00e9biles en el infrarrojo medio<\/li>\n<li>Disoluciones acuosas y muestras biol\u00f3gicas en las que la interferencia del agua domina el FTIR<\/li>\n<li>Medici\u00f3n a trav\u00e9s de viales de vidrio o envases, o muestreo in situ y remoto<\/li>\n<li>Mol\u00e9culas sim\u00e9tricas cuyas vibraciones son inactivas o d\u00e9biles en el infrarrojo<\/li>\n<\/ul>\n\n<h2>Lista de comprobaci\u00f3n para la selecci\u00f3n<\/h2>\n<ol>\n<li>\u00bfCu\u00e1l es el estado de la muestra: polvo, s\u00f3lido, pel\u00edcula, l\u00edquido o gas?<\/li>\n<li>\u00bfContiene agua la muestra y se puede secar?<\/li>\n<li>\u00bfEl compuesto objetivo es org\u00e1nico (favorece FTIR) o inorg\u00e1nico (favorece Raman)?<\/li>\n<li>\u00bfDebe la muestra permanecer en su envase o en una atm\u00f3sfera controlada?<\/li>\n<li>\u00bfSe requiere una biblioteca de referencia o un m\u00e9todo regulado?<\/li>\n<li>\u00bfDe cu\u00e1nto tiempo de preparaci\u00f3n y qu\u00e9 nivel de experiencia se dispone?<\/li>\n<\/ol>\n\n<h2>La parte FTIR en Hench<\/h2>\n<p>Hench suministra espectr\u00f3metros FTIR y el equipo de preparaci\u00f3n de muestras que los acompa\u00f1a:<\/p>\n<ul>\n<li><a href=\"\/infrared-spectrometer-category\/\">Espectr\u00f3metros FTIR<\/a> \u2014 modelos ENERGY-30, MATRIX-50 y LIDA-20<\/li>\n<li><a href=\"\/ftir-accessories\/\">Accesorios FTIR<\/a> \u2014 accesorios ATR, celdas de l\u00edquidos y gases, portamuestras<\/li>\n<li><a href=\"\/kbr-pellet\/\">Preparaci\u00f3n de pastillas de KBr<\/a> \u2014 mortero, polvo de KBr, troqueles de 13 mm y prensas<\/li>\n<li><a href=\"\/atr-ftir-vs-kbr-pellet-ftir-comparison-article\/\">ATR frente a pastilla de KBr en FTIR<\/a> \u2014 c\u00f3mo se comparan las dos v\u00edas de muestreo<\/li>\n<\/ul>\n\n<h2>Preguntas frecuentes<\/h2>\n<h2>Notas de m\u00e9todo para elegir la t\u00e9cnica<\/h2>\n<p>Elija la t\u00e9cnica seg\u00fan la muestra y la pregunta: el FTIR responde qu\u00e9 grupos funcionales est\u00e1n presentes y es la opci\u00f3n rutinaria para polvos, pel\u00edculas y l\u00edquidos, mientras que Raman es m\u00e1s potente en muestras con agua, cargas inorg\u00e1nicas, envases y medici\u00f3n in situ a trav\u00e9s de vidrio o pl\u00e1stico. Si el laboratorio necesita ambas, planifique un banco de preparaci\u00f3n compartido con prensa, troqueles y equipo de secado.<\/p>\n\n<h3>\u00bfPuede Raman sustituir al FTIR?<\/h3>\n<p>Para algunas muestras s\u00ed, pero no para todas. El agua y los compuestos inorg\u00e1nicos favorecen Raman; la identificaci\u00f3n de org\u00e1nicos y la comparaci\u00f3n con bibliotecas suelen ser m\u00e1s f\u00e1ciles con FTIR. Por eso muchos laboratorios mantienen ambas t\u00e9cnicas.<\/p>\n<h3>\u00bfQu\u00e9 t\u00e9cnica requiere menos preparaci\u00f3n de muestra?<\/h3>\n<p>Raman suele ser m\u00e1s r\u00e1pido de preparar, mientras que FTIR a menudo requiere una pastilla, un mull o contacto ATR. La disyuntiva se describe en esta p\u00e1gina y en la <a href=\"\/7-proven-methods-a-guide-on-how-to-prepare-sample-for-ir-spectroscopy-article\/\">gu\u00eda de preparaci\u00f3n de muestras IR<\/a>.<\/p>\n<h3>\u00bfSuministra Hench instrumentos Raman?<\/h3>\n<p>Hench se centra en espectr\u00f3metros FTIR y equipos de preparaci\u00f3n de muestras de laboratorio; esta p\u00e1gina explica d\u00f3nde encaja el FTIR respecto a Raman para elegir el m\u00e9todo adecuado.<\/p>\n\n<p style=\"margin-top:30px\"><strong>\u00bfNecesita una configuraci\u00f3n para su laboratorio?<\/strong> Env\u00ede el tipo de muestra, el tama\u00f1o de pastilla objetivo y el rendimiento a trav\u00e9s de la <a href=\"\/contact-us\/\">p\u00e1gina de contacto<\/a> y propondremos la lista de equipos.<\/p>\n\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Home FTIR vs Raman FTIR vs Raman FTIR and Raman both probe molecular vibrations, but they measure different physical events and therefore suit different samples. FTIR measures how much infrared light a sample absorbs; Raman measures the small shift in scattered laser light. Understanding where each technique is strong avoids buying the wrong instrument or [&hellip;]<\/p>","protected":false},"author":0,"featured_media":6731,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-6768","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>FTIR vs Raman | How to Choose the Right Spectroscopy Method | Hench<\/title>\n<meta name=\"description\" content=\"FTIR and Raman spectroscopy are complementary techniques. 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