Raman Spectroscopy
Molecular and crystallographic structural analysis by inelastic scattering of laser light.
O que é RAMAN
Uma técnica de análise avançada
Molecular and crystallographic structural analysis by inelastic scattering of laser light.
Comparação de configurações
Resolução, o que revela e preparo por configuração
| Configuração | Resolução | O que revela | Uso típico | Preparo de amostra |
|---|---|---|---|---|
| ER | Set by the specific optical configuration used. See the confocal and TERS rows below for typical values. | A general molecular vibrational fingerprint and crystalline phase from inelastic scattering of laser light, used to confirm identity and assess crystal form. | Applies across every configuration below. The confocal or TERS setup is chosen based on the spatial resolution and depth information the analysis requires. | Varies by the configuration selected. See the confocal and TERS rows below. |
| ER-C | Diffraction limited spatial resolution of about 1 micrometer, set by the laser wavelength and the microscope objective. | A general molecular vibrational fingerprint and crystalline phase, used for polymorph screening and ingredient mapping across a wide sample area. | Bulk or wide area molecular identification, polymorph screening, and non destructive analysis, including through glass or blister packaging. | Minimal to none. Works directly on solids, liquids, and powders, often without removing the sample from its container. |
| ER-TERS | Near field spatial resolution in the 10 to 30 nanometer range, achieved by enhancing the laser field at a sharp probe tip. | Nanoscale chemical composition at individual particles or surface features, well beyond what confocal optics alone can resolve. | Nanomaterial characterization, catalytic surface site mapping, and single nanoparticle or single molecule studies that require sub micrometer resolution. | High. Requires a flat, tip compatible substrate and careful probe alignment, so the sample generally needs to be a thin film or an exposed nanostructured surface rather than a bulk solid. |
What sets us apart
We don't hand over a spectrum. We hand over the interpretation.
Any lab can return peaks and numbers. Our report reads the data. Three differences define what we deliver — illustrated below with a real, anonymized case.
Multiple techniques, one integrated report
We don't hand back five loose reports. We cross-reference every technique's results into a single reading — each signal checked against the others — to reach an answer, not a pile of data.
- Contamination investigation — identifying and tracing the source of a foreign species.
- Performance degradation — explaining why a batch behaves outside expectations.
- New supplier validation — proving equivalence before switching.
3 LDPE batches · 4 techniques converge, NMR reveals the difference
In semicrystalline polymer systems, thermomechanical processing variables influence chain conformational dynamics¹. Solid-state NMR resolves chemical environments at the nanometer scale², sensitive to changes not detectable by XRD or FTIR³.
Technical justification anchored in the literature
Every technique choice and every inference in the report is backed by peer-reviewed literature — with citations in the text. The conclusion isn't loose opinion: it's a traceable argument, defensible in an audit and in front of the client.
- Numbered citations linking claim to source
- Official standards and methods referenced per analyte
- Auditable reasoning end to end
Conclusion and expert opinion
The report closes with a clear position, signed by the Principal Investigator: what the data shows, what can't yet be claimed, and the next step. It includes an honest caveat on the limits of inference — what separates a technical opinion from a guess.
- Explicit technical position, not just results
- Inference limits declared honestly
- Next-step recommendation signed by the P.I.
Four techniques confirmed equivalence; only the solid-state NMR revealed the subtle conformational change not distinguishable by conventional QC — a molecular signature consistent with the atypical filtration behavior.
Without the industrial line's parameters, no direct causal correlation can be established — a complementary step is recommended for elucidation.
Aplicações de mercado
Onde a RAMAN entrega resultados
Market Applications
Pharma
- API distribution mapping
- Chemical heterogeneity analysis
- Crystalline form studies
- Nanoparticle characterization
- Non-destructive tablet analysis
Materials
- Material stress mapping
- Carbon and graphene characterization
- Crystal phase analysis
- Corrosion studies
- Nanocomposite characterization
Cosmetics
- Active ingredient mapping
- Liquid crystal analysis
- Metallic nanoparticle characterization
- Skin penetration studies
- Mineral analysis in formulations
FAQ
Frequently Asked Questions about Raman Spectroscopy
How is Raman spectroscopy different from FTIR if both measure molecular vibrations?
- Both probe vibrational modes but through different physical mechanisms with different selection rules: FTIR measures infrared absorption and is most sensitive to polar bonds (C=O, O-H, N-H), while Raman measures the scattering of laser light and is strongest for non-polar, symmetric vibrations (C=C, S-S, aromatic ring breathing modes) — making the two techniques complementary rather than redundant.
Can Raman analyze a sample through glass, packaging, or in water?
- Yes — because Raman uses visible or near-infrared laser light rather than direct-contact infrared absorption, it can often analyze a sample through a transparent container, glass vial, or blister pack, and works well for aqueous samples where water's strong infrared absorption would interfere with FTIR.
What does "confocal" add to Raman spectroscopy?
- The confocal optical setup restricts the collected signal to a very thin focal plane, giving Raman high spatial resolution (down to roughly 1 micrometer) and allowing a sample to be optically sectioned in depth — useful for mapping the distribution of an active ingredient or a specific crystalline phase across a tablet cross-section or a heterogeneous material.
Does my sample need special preparation for Raman analysis?
- Raman generally requires little to no sample preparation and is compatible with solids, liquids, powders and, in many cases, samples inside their original packaging, since the laser can be focused directly onto the material without physical contact.
Can Raman distinguish between different crystalline forms of a compound?
- Yes — because different polymorphic or crystalline arrangements often produce measurably shifted or split Raman bands (particularly in the low-frequency lattice-vibration region), Raman mapping is a standard tool for identifying and mapping the spatial distribution of specific crystal forms within a sample.
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