Introduction to mass spectrometry (1)

[@chimairoegbu2263]

so glad u gave up two and a half men for teaching. this is ur calling

[@Chriskeaten]

Thanks, based-god Allan.

[@Candicedickinsonllc]

I've been trying to figure out who this man reminds me of 😂😂😂😂😂😂😂😂

[@satkarandhillon3540]

This guy is sooo much better than all of the organic chem profs at my university...

[@pancreasdragonheart9765]

This is how chemistry/physics needs to be taught. There are no leaps or unexplained events in this video, it is a complete, concise, logical path from beginning to end. I've seen so many videos on youtube and I am so glad there are people who understand the difference between presenting information and education. Also, seeing a person moving around and writing on the black board (which seems to have an huge impact on me) are keeping my interest in watching the video.

[@gerald4535]

Been trying to figure out IR, CNMR, H-NMR, etc spectroscopy all weekend for an exam today and none of it is sinking in. This was clear and concise. My orgo professor is always all over the place. Thanks so much.

[@tashabasha3]

This makes so much sense now. This man is a genius, i love how he breaks it down in simple language...unlike most professors! He deserves to be paid for this! Thanks so much sir!

[@Talha1318]

All I came here looking was to check if the molecular ion peak was always the base peak and you answered me directly. And for that I will probably do better on my orgo test this wedensday..hats off to you! thanks!

[@tnagan]

Thank you very much for your videos. I got a 4.0 in O chem 1 last quarter, and I think you are part of the reason that happened! I'm taking o chem 2 right now, and will definitely be watching your videos again. Thanks again for your time and hard work.

[@edwinortega1259]

I use to watch this guy during my undergrad at UC Berkeley, got assigned to watch his videos for my graduate program at Tufts. I have to donate to you now. Full circle. I still remember seeing you walk out of one of the classrooms and all the organic chemistry students were like "omg it's him". lol

[@sharonab07]

I watched through undergrade and have shared your knowledge and videos with so many people. I thank God for you and what you do.

[@jkludz]

My professor tried to explain this today... emphasis on TRIED. Thanks for succeeding!

[@2LonelyPlanet]

This teacher is magnificent. i would love to be in his class all day.

[@So0pRKawaii]

Idk even have a GED, and I understood that. You're like the best teacher ever, bro.

[@ehwarrior]

I've learned more in ten minutes than I did in six lecture periods. Thank you so much for the wonderful lesson!

[@esperanzazagal7241]

Very clear, thank you. I like how to pause everyone in while to make sure everyone gets it and let it sink in :) Thanks!

[@avis2twin]

You are an AWESOME Tutor!!! Your videos are extremely helpful!!! THANK YOU!!!! Plz keep up the great work/videos.

[@briannorman9]

all of your videos are incredible. thank you

[@buzsub03]

The instrument in question can be run with a "known peak/ion" value and then u can run the "unknown" sample and then calibrate it accordingly with the "known" sample or "standard".

[@sKaYj2]

I greatly appreciate this, this is the only part of Chemistry course where I didn't pay attention ^-^

[@daramgeee]

You are saving me!!! You are the MAN!!!! Thanks a bunch!!!

[@archimedes92]

thanks. we're gonna be reporting this in class. great help for student-pharmacist, PHL

[@lisahtk]

wow i jst look at my lecture notes and just go completely blank.. ur teaching methods are so easy to understand and follow thankyou!!! :D i might actually have a chance of passing chem this year :p

[@sarazuu]

true nerd, but thank you us normal people need people like you!

[@123fennec6]

Literally i had a mass spectrometry class today and it does not even compare to what this TEACHER has said. He takes the time to explain and NOT lightly touch it. I swear to god my lecturer didnt mention anything compared to the first 10 minutes of this video

[@jordiehawkins8015]

Thank you for what you do! You're a great teacher.

[@msingletary1984]

@stefan874 Very good question. Isotopes are atoms of varying numbers of neutrons. I admit i'm fairly ignorant of why materials are radioactive however it must be that their subatomic composition changes, perhaps scholastically and this causes the release of photos of varying w. On the topic of electromagnetic radiation and it's interaction with a molecule, this becomes very complex. All molecules are excitable and one of the results of fluorescence.

[@jumanaaltheeb846]

YOU ARE A LIFE SAVER !!

[@nmctelos]

You are an amazing teacher! Thank you!

[@SkukS]

It's good having students in there as well. As soon as he said the highest is the base peak and the furtherest to the right is the parent peak, I was like can they be the same? Then student asked exactly what I wanted! :D:D:D:D

[@captainthrall]

thanks from a purdue university student taking organic chemistry

[@msingletary1984]

@stefan874 This is the essence of NMRI (nuclear magnetic resonance imaging) or commonly known MRI. Or x-ray imaging devices, cause your body to fluoresce and this data is used to create the image.

[@Wesleypaul1991]

This is amazing!!! Great Job

[@AkoniLokepa]

Because it M+ give your the exact molecular weight of the unknown molecule you are trying to figure out. So it will not take into affect the lose of any electron. The molecule you determine you have should be the molecular weight equal to the value of the M+ peak on the graph. I hope that makes scene and is right. =]]

[@KelanONcamera]

great teacher, very helpful thanks for uploading

[@KANGKANGKUNG]

Thanks. How are the peaks of methane (mw=16) and oxygen (M=16) differentiated?

[@FoolishInTheEnd]

is this peak always the one furthest to the right or the one with the highest m/z?

[@emilyeng4697]

omg u r a life savior. you are amazing and thank you so so so much!!!!

[@MunkesGamingDenmark]

I find MS really hard. I will give your videos a shot. Thx!

[@yougosquishnow]

isotopes are functions of elements (those things on the periodic table) NOT molecules. An isotope basically has the same number of protons but a different number of neutrons. Radiation comes into the picture because alpha, beta, and gamma radiation can be produced by the breakdown of an isotope example, uranium 238, which is unstable so it decays, producing radiation, to uranium 234 etc which is why uranium is radioactive. Heat is a form of radiation as well, so yes you do produce radiation :)

[@Flex_Singh]

Very useful! Thank You so much.

[@DMBKristen41]

If the M+ peak is the furthest to the right, how do you know if it is the M+ peak or the M+1 peak?

[@olympiakaran7]

thanks from an IB year 2 student!

[@MohamedGamal-rv3cm]

amazing explanation , keep it up

[@msnnbc]

Thank you so much! You are amazing.

[@skyway2006]

this is a blessing

[@greatsea]

lookout we got a mouth breather over here. 4:16

[@googleaccofalex]

TANK. No, seriously this is a great video... Thank you:)

[@MsBeastly1236]

this is so helpful, thank you a ton!

[@BruceLeePs3]

great video!

[@rohansteenbeek8025]

Great video's!

[@lokithor83]

You are AWESOME!

[@isilmuslu]

good lecture for chemistry students

[@CheBoluda88]

Would love a video with mass spec involving Nitrogen :)

[@Pyroteknitian]

if m/z is 16 for an unknown sample, what does the mass spectrometer have/do to tell you its methane, not oxygen? or are there other calculations involved?

[@DiRTyCHaVeZZ]

Pyroteknitian You wouldn't see fragmentation on a single oxygen molecule, flies away

[@Pyroteknitian]

So then in a container that has a mixture of unknown gasses, what procedure would you follow to begin identifying them? I'm basically looking to know by which methods does science identify substances, pure or otherwise.

[@dirtychavez1621]

Pyroteknitian excellent question. You might see people say lc-ms or gc-ms. Those are chromarographic techniques hooked up to the mass spec (ms). Lets use hplc for this example. Liquid chromatography separates one substance at a time based on volitility and size thwse then pass (one at a time) through the mass spec. So lets say you have ethanol and diatomic oxygen and ethanol passes first the oxygen wont interfere with the spectra later as the solvent gradient changes out comea your oxygen its split when ionized and you will see only oxygen.

[@AkoniLokepa]

M+ is normally the one all the way to the right. Beware sometimes it may be so small you can not even see it. Actually this was the case for one on my test today. I had to draw out the spectrum from hand. What a nightmare! =]]

[@19perox05]

thank you for sharing... thanks a lot!!

[@blooms125]

man you are great ! thank you !

[@msingletary1984]

@KANGKANGKUNG Can be differentiated by a fragmentation pattern difference between the two molecules.

[@wildzubatappeared]

Thanks you so much I was lost at school

[@jrt50011]

Very informative, thanks. However, creepy stare at 4:15 ... lasts a few seconds too long.... very serial-killer like.

[@fakingtrels]

jrt50011 he's checking to make sure they've gotten everything written down ya dingus

[@PeaceMah]

He is clearly reading you dumb fuck. Slap yourself.

[@princessmaram]

this really helps ! thank you =)

[@qwertywerty123456]

very awesome!

[@ThePwndage]

He certainly has the right glasses for the job

[@airsh0w]

Thank you!

[@taha03ful]

thnx Sir got it 50% !

[@mclarros]

Thank you so much!

[@MrSaad1932]

ummm i thought you are supoesed to use magnetism and elsctric forces to find out the mass of a particle in a mass spectrometer...

[@GARDENERSTOES]

blackboards are very noisy, jeez. but thank you so much this really helped.

[@loxy777]

thank you sir, cux m not taking tuitions which makes u my sir. thanks! m from pakistan. can u help me physics n biology tooo?? pweese!

[@OllieSaFc]

Alan Harper?

[@danielchong1234]

really useful!!!!! ^^ thx

[@davec3487]

Processing, processing--- output

[@saranoora]

well our professor asked us to draw the whole spectrum :( I wish i was as smart as you.. and i wish if u were our professor !!!

[@AkoniLokepa]

Wow. That's what my crazy professor was trying to say during lecture. lol

[@ipodchik]

@randombuddypotato: Haha, I noticed that too. Great teacher!

[@dwnwthisortofthing]

dude you rock!

[@dt14tennis]

Thank youuu.. I knew he looked familiar.

[@HipHopSenate]

I like the way he explains something then he looks in the class to see who's fuckin lost!!!

[@MrBrianbeyer]

@rosindhu Ha yeah Professor's should just watch this guy's videos to learn how to teach.

[@Melpomeneh]

@indianaintasian still haven't learned to wear deodorant though

[@msingletary1984]

The parent is very rarely the furthest to the right...isotopes!

[@Slimshady50182]

Thanks homie! It

[@SlyHobbit]

I think he said that was a RADICAL CAT ION....or something like that....

[@tghillgeospatial]

thanks brah

[@Lrobert152]

Well physics and chemistry are pretty interrelated...

[@JennnSaidWhat]

I think he was waiting on the student to finish copying down the info from board before continuing

[@acoow]

4:47 M/z, in the real world, is called "mass to charge ratio". It is called mass to charge ratio because it really is a ratio of the mass to the charge. Z is not always 1. Some of the cations have a will have a double charge. In this case z=2. Your student needs to learn to look for these double charges when reviewing the results of the analysis - else she risks reporting bad results to her customer.

[@StoicRS]

Since you know the stuff so well, you should make a video on it

[@acoow]

***** I'm too busy doing what he is talking about to do a video about it.

[@bobbyhill601]

When you're in organic chemistry one, about 99% of everything z will equal 1....

[@HealthyFoodBae_]

Thank u, thank u!!

[@feefee2]

If there was a -1 u cud click instead of a +1 I'd definitely be hitting it for this. Lol

[@HealthyFoodBae_]

-1 Fee Fee why? Lol

[@feefee2]

Because letters shouldn't b part of math. Numbers only. Lol

[@HealthyFoodBae_]

U silly Fee Fee

[@feefee2]

Lol. Can u tell how much I hate this? When r u plannin on testing?

[@geico1212]

wow he changed his shirt real quick.

[@buzsub03]

There are several different proteins. I wouldn't say there are isotopes or proteins of this nature. Why haven't u "Googled" u'r question?

[@ToPgunnerify]

How many people is he lecturing??

[@bootleg_sunflour]

LOL 4:16... blank stare. good lecture though!

[@Anchony]

4:15-4:23 he is over taken by Schroedinger

[@jkman10]

You look exactly like Jon Cryer.

[@74535seshu]

nice

[@MoreKevinLiang]

@glennmc300 it was even funnier when there was no sound just watching his eyes dart around

[@katUnMause]

4:17 love that face tho

[@katUnMause]

The video was also nice

[@himehime90]

@AkoniLokepa lol me too I think this prof is good

[@rosindhu]

@MrBrianbeyer lol he zoned out for a bit... he do w.e. he wants tho his the only reason im gonna get a A on this topic.

[@ICommentWhy]

Nice shirt! Where can I get one? No, seriously!

[@kooksies5712]

its alan from two and a half men