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Fragmentation of molecules undergoing this technique is observed in the McLafferty rearrangement. In one form of this technique, selected reaction monitoring is used to select ions for the next stage of processing. Michael Barber invented a technique used during this process where a beam of high energy atoms strike a surface in a technique called fast atom bombardment. Multiple rounds of this technique are performed in its “tandem” variety. Molecules may be prepared for this technique by undergoing electrospray ionization or MALDI. Plots in this technique often coupled with gas chromatography plot intensity against m-over-z. For 10 points, name this technique that separates molecules based on their mass-to-charge ratio. ■END■
| 2025 ACF Nationals | 2025-08-09 | Y | 9 | 100% | 0% | 22% | 75.44 |
| Canada | Main | Y | 6 | 100% | 0% | 17% | 75.67 |
| Florida | Main | Y | 12 | 92% | 0% | 0% | 74.91 |
| Great Lakes | Main | Y | 3 | 67% | 0% | 0% | 60.00 |
| Overflow | Main | Y | 1 | 100% | 0% | 0% | 10.00 |
| California | Main | Y | 4 | 100% | 0% | 0% | 30.50 |
| South Central | Main | Y | 5 | 80% | 0% | 20% | 97.25 |
| UK | Main | Y | 4 | 100% | 0% | 0% | 67.00 |
| Upper Mid-Atlantic | Main | Y | 8 | 100% | 0% | 0% | 48.13 |
| Upstate NY | Main | Y | 8 | 100% | 0% | 13% | 77.13 |
| Pacific Northwest | Main | Y | 10 | 100% | 0% | 20% | 57.80 |
| Player | Team | Opponent | Buzz Position | Value |
|---|---|---|---|---|
| Allan Lee | Stanford B | Berkeley C | 10 | 10 |
| Braden Booth | Missouri A | WashU A | 10 | 10 |
| Benjamin Chapman | Toronto A | McGill C | 11 | 10 |
| Raymond Chen | Toronto B | Toronto I | 11 | 10 |
| Shiva Tegulla | UCF A | UCF B | 11 | 10 |
| Jacob Finley | Notre Dame A | Michigan A | 11 | 10 |
| Alex Akridge | Indiana A | Notre Dame B | 11 | 10 |
| Sarah Dong | Michigan C | UIC | 11 | 10 |
| Russell Nip | British Columbia D | Washington A | 11 | 10 |
| Bryan Ugaz | Arizona State A | McGill D | 11 | 10 |
| Jack Lewis | Bruin A | Vanderbilt A | 11 | 10 |
| Eugenia Tong | Imperial A | Sheffield B | 11 | -5 |
| Michał Gerasimiuk | Stanford A | Berkeley B | 14 | 10 |
| Nolan Travers | Tulsa | Iowa | 17 | 10 |
| Sharath Narayan | Northwestern A | Northwestern B | 17 | 10 |
| Matthew He | Texas A | Texas B | 17 | 10 |
| Jakub Hel | UAB A | Alabama B | 17 | 10 |
| Collin Leck | UCO | Alberta B | 20 | 10 |
| Tate Osborne | Auburn A | Georgia Tech D | 23 | -5 |
| Tanay Bodducherla | Berkeley E | Berkeley A | 31 | 10 |
| Eloise Wood | Imperial B | LSE A | 31 | 10 |
| Snehan Saroch | Louisville A | Chicago D | 40 | 10 |
| Aarav Kakad | UCLA C | UCSB | 47 | 10 |
| Juliette Flatau | Imperial C | Sheffield C | 47 | 10 |
| James Morgan | Oxford A | Southampton A | 48 | 10 |
| Aryan Desarapu | Michigan B | Chicago C | 62 | -5 |
| Aaryan Sumesh | Berkeley D | Stanford C | 67 | 10 |
| Fish Tsai | UCSD Two Running Violet V Forms | UCLA A | 68 | 10 |
| Samarth Ram | Chicago B | Purdue C | 68 | 10 |
| Kevin Ye | Simon Fraser | Washington B | 68 | 10 |
| Matthew Sumanen | Georgia Tech A | Georgia Tech B | 68 | 10 |
| Kevin Yang | Illinois C | Purdue B | 69 | 10 |
| Krishay Garg | UCLA D | UCSD Vices and Virtues | 71 | 10 |
| Nihal Jacob | Kentucky | Purdue A | 71 | 10 |
| Arvin Boraghi | Cambridge B | City St George's A | 72 | 10 |
| Franklin Wu | Toronto C | McMaster C | 75 | 10 |
| Asha Basu | McGill A | Toronto H | 78 | 10 |
| Yusuf Baig | McMaster A | Carleton | 78 | 10 |
| Nabhaan Farooqi | McGill B | Toronto D | 78 | 10 |
| Nathan Easow | Manchester A | Durham B | 78 | 10 |
| Jiping Fang | Illinois B | Notre Dame D | 79 | 10 |
| Hamish Campbell | Durham A | Sheffield A | 79 | -5 |
| Annika Larson | Claremont Scripps | UCI | 80 | 10 |
| Jake Wingfield | Bristol B | Cambridge C | 80 | 10 |
| Andrew Nucci | UCLA B | USC | 81 | 10 |
| Cole Hammans | Nebraska | Minnesota C | 81 | 10 |
| Yoyo Liu | British Columbia A | British Columbia C | 85 | 10 |
| Mohammad Khan | UTD A | UTD B | 85 | 10 |
| James Xiao | Toronto E | Queen's B | 90 | 10 |
| Aaron Marchand | Carleton | Macalester B | 90 | -5 |
| Monish Jampala | Georgia Tech C | Vanderbilt B | 90 | 10 |
| Jeremy Kim | Toronto K | Ottawa | 91 | 10 |
| Nathan Woolery | Louisville B | Notre Dame C | 92 | -5 |
| Connor King | St. Thomas | Macalester A | 92 | 10 |
| Gary Lin | UCSD What Hath God Wrought | Claremont Pitzer | 94 | -5 |
| Platon Gorokhov | Toronto F | Guelph B | 94 | 10 |
| Max Mao | British Columbia B | Alberta | 104 | 10 |
| Gabrielle Smith | Auburn B | Sewanee A | 106 | 10 |
| Sarah Silverman | Claremont Pitzer | UCSD What Hath God Wrought | 107 | 10 |
| Foster Hughes | Minnesota A | Minnesota B | 107 | 10 |
| Kaushul Manikandan | Huntsville A | Huntsville B | 107 | 10 |
| Andrew Fisher | Sheffield A | Durham A | 107 | 10 |
| James Carrick-Lawson | Southampton B | Oxford B | 107 | 10 |
| Eva Mandelbaum | Guelph A | McMaster B | 109 | 10 |
| Thomas Brittain | McMaster B | Guelph A | 109 | 0 |
| Gavin Ge | Waterloo | Toronto J | 109 | 10 |
| Zaire Gibbons | Toronto J | Waterloo | 109 | 0 |
| Charlotte Wilcox | Western Ontario | Toronto Metropolitan | 109 | 0 |
| Ishan Joshi | Toronto Metropolitan | Western Ontario | 109 | 0 |
| Mateo Acosta | FIU | UF B | 109 | 0 |
| Jeevan Iyadurai | UF E | UF A | 109 | 10 |
| June Miller | UF B | FIU | 109 | 0 |
| Kennedy Gallaher | Notre Dame C | Louisville B | 109 | 10 |
| Sasha Tripathi | Chicago C | Michigan B | 109 | 10 |
| Ben Weng | Macalester B | Carleton | 109 | 0 |
| Alex Smits | Wisconsin | Iowa State | 109 | 10 |
| Jeremy Mau | Northwestern C | Arizona State B | 109 | 0 |
| Cassidy McIntyre | Rose State | Ohio | 109 | 10 |
| Young Fenimore Lee | Ohio | Rose State | 109 | 0 |
| Ruby Xia | Arizona State B | Northwestern C | 109 | 10 |
| Samir Sarma | Georgia Tech D | Auburn A | 109 | 10 |
| Sawyer Smith | Mississippi State A | Alabama A | 109 | 10 |
| Laura Bullock | Sheffield B | Imperial A | 109 | 10 |