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Raman spectroscopy Options
 
Loveall
#61 Posted : 8/13/2018 11:00:04 PM

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Question, in the post above capturing fluorescence (link below). Does the broad peak at 1900cm-1 shift from a 532nm laser tell us anything? Is it consistent with what would expect from DMT fluorescence? Could I use that to grossly check for psilocybin, etc?

I guess what I'm asking is there a database for broad fluorescent peaks for our favorite molecules? Thank you.

https://www.dmt-nexus.me...&m=895369#post895369
β€œ... (a) psychedelic substance occasionally causes psychotic behaviour in people who have not taken it.”
Excerpt from a McKenna talk transcript / audio.
 

Trippy glass for trippy people.
 
benzyme
#62 Posted : 8/14/2018 1:24:49 PM

bioanalytical chemist

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unfortunately, I don’t think anything can be extrapolated from a fluorescence peak. Some fully-integrated commercial systems
use algorithms to compensate for flourescence bands.

how did you get scattered bands? everything I scan with the probe shows up as 532nm, even with the notch filter. Confused
"Nothing is true, everything is permitted." ~ hassan i sabbah
"Experiments are the only means of knowledge at our disposal. The rest is poetry, imagination." -Max Planck
XMR 46JqfBqi7JNM1W5rXXZ1FF1CBKKLoGEVBRya9Cn3RJmPbQhT4GeZpVKWbwaVe4vUMveKAzAiA4j8xgUi29TpKXpm3whx5MW
BTC 3CNrz6Tj17U35GLkRB1zsNtVoedorw8oja
ETH 0xd433198cb786145767c67d874b36cd7d42baf57a
 
Loveall
#63 Posted : 8/14/2018 2:24:06 PM

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Not sure. I spent some time focusing the optical tube system as simulated in the ray tracer program. Maybe that helps, if out of focus the Raman signal may be weak?

I'd be happy to lend you the assembled optical tube and it's cuvette for troubleshooting purposes. You'd just need to screw in the SMA optical cable. Let me know if you want to check it out.
β€œ... (a) psychedelic substance occasionally causes psychotic behaviour in people who have not taken it.”
Excerpt from a McKenna talk transcript / audio.
 
benzyme
#64 Posted : 8/14/2018 2:41:48 PM

bioanalytical chemist

Moderator | Skills: Analytical equipment, Chemical master expertExtreme Chemical expert | Skills: Analytical equipment, Chemical master expertChemical expert | Skills: Analytical equipment, Chemical master expertSenior Member | Skills: Analytical equipment, Chemical master expert

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no need, but that’s very kind of you. appreciate it. Big grin
but you just reminded me to get a cuvette holder, just bought it.

I loaded up all the parts, cables, stand, and laptop into a backpack given to me by my company
during Lab Week. So convenient. My coworker jokingly said I could set up at festivals.
"Nothing is true, everything is permitted." ~ hassan i sabbah
"Experiments are the only means of knowledge at our disposal. The rest is poetry, imagination." -Max Planck
XMR 46JqfBqi7JNM1W5rXXZ1FF1CBKKLoGEVBRya9Cn3RJmPbQhT4GeZpVKWbwaVe4vUMveKAzAiA4j8xgUi29TpKXpm3whx5MW
BTC 3CNrz6Tj17U35GLkRB1zsNtVoedorw8oja
ETH 0xd433198cb786145767c67d874b36cd7d42baf57a
 
downwardsfromzero
#65 Posted : 8/19/2018 8:55:44 PM

Eggnogstic - warning: Self-irony levels: high!


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Food for thought from this video:
Ora, lege, lege, lege, relege et labora

β€œTo be GOVERNED is to be watched, inspected, spied upon, directed, law-driven, numbered, regulated, enrolled, indoctrinated, preached at, controlled, checked, estimated, valued, censured, commanded, by creatures who have neither the right nor the wisdom nor the virtue to do so. To be GOVERNED is to be at every operation, at every transaction noted, registered, counted, taxed, stamped, measured, numbered, assessed, licensed, authorized, admonished, prevented, forbidden, reformed, corrected, punished. It is, under pretext of public utility, and in the name of the general interest, to be place under contribution, drilled, fleeced, exploited, monopolized, extorted from, squeezed, hoaxed, robbed; then, at the slightest resistance, the first word of complaint, to be repressed, fined, vilified, harassed, hunted down, abused, clubbed, disarmed, bound, choked, imprisoned, judged, condemned, shot, deported, sacrificed, sold, betrayed; and to crown all, mocked, ridiculed, derided, outraged, dishonored. That is government; that is its justice; that is its morality."
― Pierre-Joseph Proudhon
 
downwardsfromzero
#66 Posted : 10/6/2018 1:35:24 AM

Eggnogstic - warning: Self-irony levels: high!


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Stumbled across this document, don't know if it's been referenced here already:

Forensic Science International, Volume 273, April 2017, Pages 113-123
Identification of new psychoactive substances (NPS) using handheld Raman spectroscopy employing both 785 and 1064 nm laser sources

https://doi.org/10.1016/j.forsciint.2017.01.027

Edit: linked to from this article, which interestingly mentions "synthetic prophetic libraries".

How's the project going?
Ora, lege, lege, lege, relege et labora

β€œTo be GOVERNED is to be watched, inspected, spied upon, directed, law-driven, numbered, regulated, enrolled, indoctrinated, preached at, controlled, checked, estimated, valued, censured, commanded, by creatures who have neither the right nor the wisdom nor the virtue to do so. To be GOVERNED is to be at every operation, at every transaction noted, registered, counted, taxed, stamped, measured, numbered, assessed, licensed, authorized, admonished, prevented, forbidden, reformed, corrected, punished. It is, under pretext of public utility, and in the name of the general interest, to be place under contribution, drilled, fleeced, exploited, monopolized, extorted from, squeezed, hoaxed, robbed; then, at the slightest resistance, the first word of complaint, to be repressed, fined, vilified, harassed, hunted down, abused, clubbed, disarmed, bound, choked, imprisoned, judged, condemned, shot, deported, sacrificed, sold, betrayed; and to crown all, mocked, ridiculed, derided, outraged, dishonored. That is government; that is its justice; that is its morality."
― Pierre-Joseph Proudhon
 
Loveall
#67 Posted : 10/7/2018 4:49:28 PM

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downwardsfromzero wrote:
Stumbled across this document, don't know if it's been referenced here already:

Forensic Science International, Volume 273, April 2017, Pages 113-123
Identification of new psychoactive substances (NPS) using handheld Raman spectroscopy employing both 785 and 1064 nm laser sources

https://doi.org/10.1016/j.forsciint.2017.01.027

Edit: linked to from this article, which interestingly mentions "synthetic prophetic libraries".

How's the project going?


Thanks for the link.

The optical tube is giving strong clean signals for bulk toluene. Seems like the focusing and light collection with 2x light passes strategy worked with a simple and convenient self-aligned optical tube setup which we simulated first. The equations to understand the system and mirror angle setup checked out.

However, we need to update they system to longer wavelength as 532nm source laser causes large fluorescence for our favorite molecules as Benz predicted. For that we need a new optical laser filter and longpass edge filter, and I'm struggling to find a good longpass edge filter that is economical. Would be very helpful if someone could find a good one for a laser Raman system and post the link here.

Looking for something like this, https://www.ebay.com/itm...Sputtered/311901684396. Unfortunately seller is on vacation now.

I also got some Ag powder from China. Gonna see if that enhances Raman enough to get a measurable Raman structure in the flourescent spectra. That's a long shot, but gonna try it soon.
β€œ... (a) psychedelic substance occasionally causes psychotic behaviour in people who have not taken it.”
Excerpt from a McKenna talk transcript / audio.
 
downwardsfromzero
#68 Posted : 10/7/2018 11:07:19 PM

Eggnogstic - warning: Self-irony levels: high!


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Quote:
I also got some Ag powder from China

What grade (mesh size, or sub-micron range) of powder did you get?

I guess you're aiming for something along the lines of what's described here: https://doi.org/10.1002/jrs.1250220904 - i.e. Surface‐enhanced Raman scattering (SERS).


Quote:
Would be very helpful if someone could find a good one for a laser Raman system and post the link here.

I found this link, but maybe it's the same seller as your above link?
https://www.ebay.de/itm/312234986248

Quote:
Details zu Optisch Filter 670EFLP 12.5 mm Rot und Ir Übertragung Emission von 665 Diode

Preis: EUR 21,22


It seems these things are sold for vehicle emissions testing, but since you've been looking into this more seriously than I have you've surely noticed that already.
Ora, lege, lege, lege, relege et labora

β€œTo be GOVERNED is to be watched, inspected, spied upon, directed, law-driven, numbered, regulated, enrolled, indoctrinated, preached at, controlled, checked, estimated, valued, censured, commanded, by creatures who have neither the right nor the wisdom nor the virtue to do so. To be GOVERNED is to be at every operation, at every transaction noted, registered, counted, taxed, stamped, measured, numbered, assessed, licensed, authorized, admonished, prevented, forbidden, reformed, corrected, punished. It is, under pretext of public utility, and in the name of the general interest, to be place under contribution, drilled, fleeced, exploited, monopolized, extorted from, squeezed, hoaxed, robbed; then, at the slightest resistance, the first word of complaint, to be repressed, fined, vilified, harassed, hunted down, abused, clubbed, disarmed, bound, choked, imprisoned, judged, condemned, shot, deported, sacrificed, sold, betrayed; and to crown all, mocked, ridiculed, derided, outraged, dishonored. That is government; that is its justice; that is its morality."
― Pierre-Joseph Proudhon
 
Loveall
#69 Posted : 10/10/2018 3:43:42 PM

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Yes, same vendor for the optics. Looks like he is back from vacation now - your post is very timely, thanks!

I got these 50nm AgNP (Silver Nano Particles). This is based on the attached paper (also attached a plot from the paper, green line is experimental fit to the SERS data, black like is theoretical).

Thanks for all your feedback and help downwardsfromzero.

PS: The link to the research you posted seems to have an extra comma at the end.
β€œ... (a) psychedelic substance occasionally causes psychotic behaviour in people who have not taken it.”
Excerpt from a McKenna talk transcript / audio.
 
downwardsfromzero
#70 Posted : 10/11/2018 10:32:29 AM

Eggnogstic - warning: Self-irony levels: high!


Posts: 3428
Joined: 30-Aug-2008
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Location: square root of minus one
Quote:
extra comma

From the forum link auto-detect - and my sloppy typing!
Corrected.

I'll be having a look at how those Ag nanoparticles are made. This would be something to play with.
Ora, lege, lege, lege, relege et labora

β€œTo be GOVERNED is to be watched, inspected, spied upon, directed, law-driven, numbered, regulated, enrolled, indoctrinated, preached at, controlled, checked, estimated, valued, censured, commanded, by creatures who have neither the right nor the wisdom nor the virtue to do so. To be GOVERNED is to be at every operation, at every transaction noted, registered, counted, taxed, stamped, measured, numbered, assessed, licensed, authorized, admonished, prevented, forbidden, reformed, corrected, punished. It is, under pretext of public utility, and in the name of the general interest, to be place under contribution, drilled, fleeced, exploited, monopolized, extorted from, squeezed, hoaxed, robbed; then, at the slightest resistance, the first word of complaint, to be repressed, fined, vilified, harassed, hunted down, abused, clubbed, disarmed, bound, choked, imprisoned, judged, condemned, shot, deported, sacrificed, sold, betrayed; and to crown all, mocked, ridiculed, derided, outraged, dishonored. That is government; that is its justice; that is its morality."
― Pierre-Joseph Proudhon
 
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