Spectrometer Definition and 161 Threads

I'm working on an experiment to measure the quenching of an oxygen-sensitive dye. The excitation light is blue and the light fluoresced is red. When I collect data, there is always a peak for blue and red, which makes it impossible to measure really the quenching in low dye concentrations...

Hi everyone, I am doing an experiment about alpha spectrum. I am using Model P-2000/1 (don't know if this matters), a NaI(Tl) scintillation probe. I selected energy range 3-8 MeV at the front panel and waited for 3000 counts at the peak, it took ~800 seconds. But when I selected energy range 4-6...

Hi I have been searching the relevant literature but I cannot find if an ion traveling through a quadruple TOF MS will obtain an axial motion and frequency as a result? and will this axial motion induce a corresponding frequency on the HV rods that could be measured with the right filter...

Well, I'm not a physician so, maybe my doubt is a little fool. Well, I'm mapping the light emitted by some lamps in some aquariums. For that, I'using a spectrometer named Ocean Optics USB4000 and a software named SpectraSuite. My intention is to discover how much is the total light getting into...

Homework Statement You are assigned the task of working with a desk-top sized magnetic spectrometer for the purpose of measuring the ratio of C12 to C14 atoms in a sample in order to determine its age.* For this problem, let's concentrate on the magnet that will perform the separation of...

Homework Statement In one type of mass spectrometer the ions are passed through a velocity selector. This is a pair of parallel plates 2.5 cm apart. A pd of 140 V is applied to create an electric field. A magnetic field is also applied so as to give a force in the direction opposite to the...

Hi I have a question regarding doing spectrometry using a FP-cavity. For a fixed wavelength, the successive maxima of the FP-cavity occur when the distance of the cavity is changed by a multiple of λ/2. This we can use to look at the spectrum of light in the cavity by changing the distance. In...

Homework Statement Suppose that you have a reflection diffraction grating with n=140 lines per millimeter. Light from a sodium lamp passes through the grating and is diffracted onto a distant screen. How wide does this grating need to be to allow you to resolve the two lines 589.00 and...

When different masses are accelerated by the same potential,the lighter mass should move with a greater velocity than that of the heavier one. But, how in the velocity selector in the Bainbridge mass spectrometer, different masses(isotopes) come out with same velocity?

I and my friend, want to build a spectrometer according to below graph basic information to design and build spectrometer are: signal level, Wavelength range, footprint and spectral resolution. we don't know two of them and that are footprint and signal level anybody can help us to...

Here's a practice diploma question I found on the internet, this isn't homework. I'm studying, I just need help on how to do this type of question. http://www.paulway.com/physics30/p30dips/p30jan2002.pdf (Page 11 Numerical Response #5) Answer: 4.80x10^-3 Homework Statement In the magnetic...

I understand that in a mass spectrometer, a particle will first pass through an accelerometer to pick up speed (presumably starting from rest). Let's say you have an electron starting from rest being passed through a difference of 1000V, it should have a kinetic energy of 1000eV right before...

(My apology if there already is a thread regarding the newly launched AMS-02, I didn't find it.) As I am sure most of you know the (second) Alpha Magnetic Spectrometer has been successfuly launched into orbit and is on its way to the ISS. I have two questions for any people here who are...

Homework Statement A magnesium ion (Mg 2+) traveling at 60000 m/s enters a mass spectrometer with a magnetic field intensity of 800T. Calculate the radius of deflection forthe magnesium ion. 800T = |B| 24.31g/mol = m 60000 m/s = v 1.66* 10^-27= Atomic mass unit r=? Homework Equations r=...

Homework Statement Natural carbon consists of two different isotopes. The isotopes have different masses, which is due to different numbers of neutrons in the nucleus; however, the number of protons is the same, and subsequently, the chemical properties are the same. The most abundant isotope...

Edit: Sorry I just realized this should be in Introductory Physics. Can a moderator could please move it? Homework Statement Show that in a mass spectrometer, the mass to charge ratio, m/q is equal to: m/q = (B2r2)/(2\DeltaV) Homework Equations F = qvBsin\theta The Attempt at a Solution...

Homework Statement Hello, one of the things I have to do for my lab report for this week is to prove that the angle between the left and right deviations of the telescope is twice the angle of minimum deviation. Its a lab where you have to find the refractive index of substances using a...

Homework Statement A certain commercial mass spectrometer is used to separate uranium ions of mass 3.92 multiplied by 10-25 kg and charge 3.20 multiplied by 10-19 C from related species. The ions are accelerated through a potential difference of 110 kV and then pass into a uniform magnetic...

I'm wondering if it would be plausible to use a cathode ray tube (crt) style monitor to build my own mass spectrometer. Unfortunately, commercial models are prohibitively expensive, but if I had plans or at least a good idea of how to build one, I have the nagging feeling I could. My idea is as...

what is the absorption spectrum in UV radiations of iron?

Homework Statement A mass spectrometer yields the following data for a beam of doubly ionized atoms of a single element. B = 8.0*10^-2 T q = 2(1.60*10^-19 C) r = 0.077 m V = 156 V I am asked to solve for Mass (m) in kg. Homework Equations q/m=((2V)/((B^2)*(r^2))) I am only...

Homework Statement Two first-order spectrum lines are measured by a 9650line/cm spectroscope at angles, on each side of the center, of +26*38', +41*02' and -26*18', -40*27'. Calculate the wavelengths based on these data.Homework Equations \lambda= (d/m)sin(\theta) The Attempt at a Solution i...

Homework Statement I'm having problem with a couple parts of this problem. I know how to work it (I think), but I'm consistently off by a couple orders of magnitude off the answer provided by the professor. I've already found that the isotope 90SR+ needs to be given a speed of...

I did a lab today using this stuff. I need to learn how to find the wavelength of the 1st order of an unknown filament. My data is 600 lines/mm grating Purple line 15 degrees 30 minutes, 15.5 degrees using the equation of d sin (angle) = m (lambda) im supposed to get something like...

Ok so for the first part my questions I do not understand how to start it off. 1. Calculate the concentration in molarity. 4.500 grams of CuSO4.2H2O is dissolved in water to make 250.0 mL solution. The concentration is labeled as M1. 2. A student used 10.0 ml of M1...

Is it necessary to know the procedure of operation of a mass spectrometer in order to select the correct calibration standards? The mass spectrometer will be used to determine the isotopic composition in a gas.

In a particular spectrometer, doubly ionised C (atomic no. 6 mass no. 12) and singly ionised Li (atomic no. 3 mass no. 6) atoms are detected. The ratio of the path radii is 1.00252, the Li having the larger value. The fields are constant. a)Find the mass of the lithium ion. Okay so i...

i was working with a spectrometer and the aim of the experiment was to find the refractive index of a prism for various colors. i was asked specifically to use mercury vapor lamp and was insisted not to use sodium vapour lamp. why is it so?

Homework Statement It's not really a book problem, just a question I encountered in my reading. For a mass spectrometer, if r = mv / qb, then r is directly proportional to mass and inversely proportional to charge. However, my reading says that the higher the mass, the less deflection. I...

Homework Statement The electric field between the plates of the velocity selector in a Bainbridge mass spectrometer is 1.05 105 V/m, and the magnetic field in both regions is 0.520 T. A stream of singly charged selenium ions moves in a circular path with a radius of 31.0 cm in the magnetic...

Hi Can anyone tell me the purpose of a entrance slit in a dispersive spectrometer. What is it good for? I guess it will create a single slit diffraction pattern. Why will this make the resolution better, instead of just colliminate the beam? Will the slit do some kind of Fourier filtering...

Q. In a particular spectrometer, doubly ionised \stackrel{12}{6}C and singly ionised \stackrel{6}{3}Li atoms are detected. The ratio of the path radii is 1.00252, the Li having the larger value. The fields are constant. Find the mass of of the lithium atom. I can only think of the equation...

Homework Statement find the angular separation between the red hydrogen-alpha spectral line at 656nm and the yellow sodium line at 589nm if the two are observed in third order with a 3500-line/cm grating spectrometer. Homework Equations maximum equation for multi-slit interference d...

If I was given that a mass spectrometer was used to separate ions of mass 3.92x10^-25 kg and charge 3.20x10^-19 C from other ions and the ions were accelerated through a potential difference of 80 kV and then sent into a uniform magnetic field, where they were bent in a path of radius 0.60 m and...

A mass spectrometer, sketched below, is a device used to separate different ions. Such ions with a well-defined velocity Vo enter through a slit into a region of uniform magnetic field B, where they follow a semicircular path until they strike the detector slit above the entry slit. The distance...

Hi, I'm a french (old) amateur scientist developping an homemade TOF mass spectrometer and I'll be pleased to know other amateur realizations in this area. I've found an homemade TEM on the web, and that's all. If someone has already tried to built such a device or know a site where I can...

Not sure where exactly this should go, as it's a hardware question rather than a homework problem or question about the theory behind it, so, sorry if it's the wrong place. But, I've been working on getting an old HP 5971A mass GC-MS up and running over the past semester, and there's a part...

I managed to do part a) of the question but got stuck on b). Why use F=(mv^2)/r for circular motion? And even if I use this equation, how do I find r, the radius? Thank you PV

Can anyone help with this problem, I have tried it a number of ways and can not get the correct answer, thanks in advance. Two isotopes of carbon, carbon-12 and carbon-13, have masses of 19.93 10-27 kg and 21.59 10-27 kg, respectively. These two isotopes are singly ionized (+e) and each is...

Hi Guys, Sorry for dumping this thread in here, I really wouldn't know where this would fit... I'm a farmer in Australia and I'm trying out these really simple devices to measure nutrient levels in my soil, they're basically a ceramic container with a small hose that gets buried into the...

Spectrometer vernier scale. Quick answer please! This is a quick question. I am measuring the emission spectra for hydrogen, but now I'm finding myself wondering about measurements in the vernier scale. I have the right and left angle measurements; however they differ by more than 180 degrees...

Homework Statement The problem can be found here; http://www.physics.uprm.edu/~mark/courses/FISI3172_I2007/PracticeExamIII.pdf Homework Equations Ok, ok. I made some reaserch, and I found that the; radius of an ion orbit on a mass spectrometer = mv / qB where m = mass, v =...

Okay. I have made a reasonably accurate spectrometer. Is there a formula that can predict the lines for a given element with a given atomic number. I have done research. The best that I found, is the formula for 'hydrogen-like' elements. So is there a formula to predict all spectral lines of any...

Homework Statement A singly charged positive ion has a mass of 2.50 x 10^-26kg. After being accelerated through a potential difference of 250 V, the ion enters a magnetic field of 0.500 T, in a direction perpendicular to the field. Homework Equations Calculate the radius of the path of...

Homework Statement Consider the mass spectrometer shown schematically in Figure 19.30 (don't have a scanner so I can't put the picture). The electric field between the plates of the velocity selector is 950 V/m, and the magnetic fields in both the velocity selector and the defelection chamber...

Homework Statement Consider the mass spectrometer shown schematically in Figure P19.30. The electric field between the plates of the velocity selector is 850 V/m, and the magnetic fields in both the velocity selector and the deflection chamber have magnitudes of 0.910 T. Calculate the radius...

Homework Statement Two isotopes of carbon, carbon-12 and carbon-13, have masses of 19.93x10^-27 kg and 21.59x10^-27 kg, respectively. These two isotopes are singly ionized (+e) and each is given a speed of 6.667x10^5 m/s. The ions then enter the bending region of a mass spectrometer where the...

I am a double major in EE and physics and I was thinking that a great senior project would be to design and build my own mass spectrometer. I would not only like to build the basic device, but also calibrate the device so that it provides the m/q value based on the radius of curvature caused by...

I am a double major in EE and physics and I was thinking that a great senior project would be to design and build my own mass spectrometer. I would not only like to build the basic device, but also calibrate the device so that it provides the m/q value based on the radius of curvature caused by...

Hi, I need to do an experiment to calculate Planck's constant from LEDs. Basically what I'm intending to do is a fairly simple variable dc supply->voltmeter->LED->spectrometer->diffraction grating->my eye type setup. I know how to do that, but the trouble is I'll need to track down a...