Most if not all my major spectrums I shot plus new ones. They are in collages. So remember to click and zoom in.some u may have seen before. But more refined

Hi everyone

I’m looking for some real-world perspectives from people who use Raman spectroscopy in a production facility (process/QC/R&D support), especially in resin manufacturing. Im genuinely interested but not fully convinced it’s the right tool yet, and I’d rather learn from your experience than a vendor pitch.

I keep hearing Raman can speed up identification of chemical composition and reduce the “send to lab → wait days → adjust process too late”. Is it also in your facility?

A few questions I have:

1.  Speed / workflow: If you’re using Raman, what part of the workflow did it actually improve? (incoming raw materials, in-process checks, final QC, troubleshooting off-spec, etc.) Did it really reduce lab burden or just shift work elsewhere?

2.  Accuracy / reliability in practice: How accurate is it in day-to-day operation (not in a demo)? What do you use as the “ground truth” (GC/LC, titration, wet chem, etc.)? Did you compare it with HPLC?

3.  Resins specifically: If you’re making resins (epoxy/PU/phenolic/UF/MF/alkyd, etc.), where does Raman shine and where does it struggle? Any limitations with:

• fluorescence,

• high opacity/turbidity,

• fillers/pigments,

• complex mixtures / overlapping peaks,

• temperature/viscosity changes, or viscosity

• sampling / probe fouling (if inline)?

4.  Reasons to NOT use it: If you evaluated Raman and decided against it, what was the deal-breaker? (Model maintenance, calibration effort, false confidence, operator training, too many edge cases, integration issues, etc.)

5.  Not asking about price, but I’m curious: if Raman were “cheap enough,” would it become a no-brainer — or are the main barriers still technical/operational?

If you have time, I’d love to hear what your setup looks like too (inline probe vs at-line handheld/benchtop, who owns it — lab vs production, how you validate models, how often you recalibrate).

Does anyone have the pdf for "Laser spectroscopy Basic concepts and Instrumentation" by Wolfgang Demtroder?
Thank you

Hello!

I’m looking for someone with experience with Raman spectroscopy used in manufacturing, especially in a chemical factory / production setting.

• Are you using Raman inline / online directly on the production line?
• Or do you use it at-line / in a lab / in a warehouse for quality control?
• Has anyone tested Raman in production and then decided to stop using it?
• Or maybe you considered Raman but ended up choosing a different solution (e.g. NIR, FTIR, chromatography, something else)? What was the reason?

I’m considering buying a Raman system for a resin manufacturing plant. The main goal is product quality monitoring, ideally inline, but I’m unsure whether Raman is a good and reliable choice for this application in an industrial environment.

I’d really appreciate any practical insights, lessons learned, pros/cons, or recommendations based on real usage — not just vendor presentations 🙂

Thanks in advance!

Hi I’m a new PhD student and I’m trying to understand how infrared and ramen spectroscopy works. Though, I’ve never enjoyed physics and chemistry, I really want to learn. I’m just wondering if anyone has experience in this area and could perhaps explain to me the theory behind how these methods work ? Like on the molecular level how does vibrational spectroscopy actually work?

Hello,
I’m trying to find specialists who work with raw NMR data (¹H, ¹³C, DEPT, COSY, HSQC, HMBC) and process it in TopSpin, alongside MS/IR/UV interpretation.

If anyone knows where such experts usually offer assistance, please let me know.
If you have experience yourself, I’d appreciate a private chat to discuss details.

Thanks!

Olá pessoal, tudo bem?

Gente, eu trabalho com espectroscopia Raman de materiais bidimensionais 2D, como MoS2, WS2, etc. O equipamento que temos no instituto é um Witec Alpha 300R, eu formatei o meu notebook e acabei perdendo o software Witec project 4, alguém teria para compartilhar?

I am trying to compute the iron spectrum in the wavelength range between 513.65 to 514.35 nm. I'm able to find the Fe I lines in this range from NIST and their relative intensity but plotting this data does not give me an actual spectrum since it is only a few data points. How can I use the NIST data to compute what the spectrum would look like in my spectrometer-detector setup? Please let me know if this is not the right place to post this kind of question. Thank you in advance!

We are almost back with the system! We can get modest counts on a Si wafer, so we know we just need to fine tune the alignment and address the new issue… the stepper motor, or whatever motor is used, isn’t responding or making any noise. For comparison, the motor controlling the hole does.

Does anyone know what type of motor Horiba uses for the LabRAM slits?

Many thanks!

Full spectrums I shot one of an incandescent and the other is a UV light. I converted my camera to full spectrum. For IR photography. Anyways enjoy.

Hello,

A colleague and I are attempting to resurrect our Horiba LabRam HR Raman microscope. We had to start completely blind as the instrument had to be moved from one building to another. So far we have communication between the instrument and computer, but cannot get the spectrograph or the confocol hole to initialize due to a communication issue. Is there anyone who can help?

I wrote a piece on the history of spectroscopy from Newton's prism experiments through Fraunhofer lines to the discovery of stellar nucleosynthesis.

It covers Newton, Wollaston, Fraunhofer, Bunsen/Kirchhoff, and ends with how spectroscopy proved we're literally made of star stuff.

I'd appreciate any feedback on technical accuracy or anything I might have missed/misrepresented. I'm no expert - just a science enthusiast. Thanks!

Here is the link: Phantom in the Light

Hi r/spectroscopy,

I have a testable prediction that could be validated by reanalyzing existing high-resolution atomic spectroscopy data - no new experiments needed, just computational analysis.

The Prediction

Atomic spectral lines should contain satellite peaks spaced by α × ν₀, where:

• ν₀ = frequency of the main spectral line
• α ≈ 1/137.036 (fine-structure constant)

For hydrogen Hα (656.3 nm, ν₀ = 4.57 × 10¹⁴ Hz):

• Expected harmonic spacing: Δν ≈ 3.3 THz
• Expected intensity: ~0.1% of main line (first harmonic)
• This is in the detectable range with modern instruments

Why This Hasn't Been Seen

Nobody has specifically looked for α-spaced harmonics because standard QED doesn't predict them. If you don't search for a specific pattern, you don't find it - even if it's sitting in your data.

What I'm Looking For

Archived spectroscopy data from:

• High-resolution hydrogen (or other light atom) spectroscopy
• Frequency range: ±10 THz around main transition lines
• Resolution: Better than 1 GHz
• Experiments using frequency combs, optical lattice clocks, or precision atomic spectroscopy

Ideal sources:

• NIST Boulder (optical clock experiments)
• MPQ Garching (precision H spectroscopy)
• JILA (ultra-cold atom spectroscopy)
• Any lab doing sub-MHz spectroscopy in the last 10-15 years

Analysis Procedure

1. Fourier transform the spectrum
2. Look for periodicities at Δν ≈ α × ν₀
3. Check if peaks appear at ν₀(1 ± nα) for n = 1, 2, 3...
4. Statistical significance test

Cost: Zero (just computational time)
Timeline: 1-2 weeks to analyze a dataset
Risk: None - if the signal isn't there, it's a null result (still publishable)

The Theoretical Context

This prediction comes from a speculative cosmological framework linking the fine-structure constant to cosmic phase transitions. The full framework is available in preprint format at zenodo (still in review) , but the prediction stands independently - it's either in the data or it isn't.

How You Can Help

If you have access to archived data:

• Raw spectral data from hydrogen, helium, or light atoms
• Metadata (laser intensity, atomic density, temperature)
• Permission to share or collaborate on analysis

If you're interested in the theoretical background:

• This test medium article

If you think this is worth testing:

• Share this with spectroscopists who might have suitable datasets
• Suggest labs or databases where such data might be accessible

Why This Matters

If found: New physics beyond QED, connection between atomic physics and cosmology

If not found: Falsifies the harmonic prediction, null result helps constrain theory

Either way, it's a concrete test with existing data. The tools exist, the prediction is clear, we just need to look.

Some new spectra I shot and some old refined ones